The following applies if you are a baptised Catholic, and a Communicant [1 | 2 | 3]. It wouldn't hurt if you were Confirmed [1 | 2 | 3] as well.

First, keep the Ten Commandments [1 | 2 3] and the Great Commandment [1 | 2 | 3];

Second, pray.

(I enjoy saying the old Latin prayers [1 | 2 | 3], especially the Prayer To St. Michael The Archangel [1 | 2 | 3]);

Third, go to Confession once a week. [1 | 2 | 3]

Fourth, take Communion at least once a week. [1 | 2 | 3]

Fifth, fast; 

Sixth, abstain from that which is both pleasing to you, and licit;

Seventh, give alms;

Eighth, visit the sick.
 

So far this is standard stuff for a good Catholic. 

Now, here is the 'back door' into Heaven:

The Indulgences promised to the Catholic faithful over the centuries have never been rescinded, despite what modernists think. 

It is possible to do penance for your sins and greatly increase your chances of getting out of Purgatory and into Heaven quickly, if you follow the conditions attached to them faithfully. Some of them are very simple to do, and easy to find using a search engine.

To start you off, here are links to web searches. This is in case particular web sites change or disappear:

Plenary Indulgences 2 | 3 | 4*

Sacred Heart Devotion - Nine First Fridays 2 | 3

Immaculate Heart Of Mary Rosary - Five First Saturdays 2 | 3

Rosary Of The Seven Sorrows 2 | 3

Gregorian Mass 2 | 3

The Brown Scapular 2 | 3

The Miraculous Medal 2 | 3

St. Benedict Medal 2 | 3
 

*Note the first four simple ones on this page.
To be certain that it will work, an indulgence must be formally approved by a Pope. This draws power from Jesus' statement 'Whatsoever you bind on Earth shall be bound in Heaven, and whatsoever you shall loose on Earth shall be loosed in Heaven'.

Subsequent Popes cannot rescind these, unless they were to publicly and formally do so. Should that ever happen, you may be sure that the Church and indeed the Earth itself is in dire straits.

These practices are not much mentioned any more. This is because the Hierarchy was, up to recently, 'hell bent' on modernisation and progress. As any factory worker knows, when the management talks about 'modernisation' and 'progress', it means mass sackings(!)

In my opinion, a smart Catholic would, in these decadent days, attend the nearest Tridentine or 1962 Latin Mass, follow the practices above and say his prayers in Latin for an added boost. 

A wise Catholic would try to save others also, besides himself. That would go down very well indeed with our Founder.

Another 'trick' is to petition individual archangels, saints or the Virgin Mary, depending on your case. As you know, you can get the ear of the Boss much more easily by going through his P.A.

Lastly, in my opinion, prayers for the benefit of others fly higher than ones for oneself. 

- It is sacrilege to take Communion unless you have been formally received into the Church.  So join up. [1 | 2 | 3] 

Admission fee: the putting aside of your infernal pride.

- Theologians who say you can get to Heaven without rituals, icons and ancient prayers are like those who say you can climb Everest without oxygen tanks, sherpas and a map. Sure, you can, in theory, but only a fool would risk it.

- There are various revelations available which claim to show that Heaven is not at all pleased with humanity at the moment. Some, like Fatima [1 | 2 3] and La Salette [1 | 2 | 3] are approved by the Catholic Church. Some, like Medjugordje and Bayside, are not. If you want to give yourself a real fright, research the following phrase: 'Warnings From The Beyond' [1 | 2 | 3] 

You see, The Devil can perform miracles too, and put on a holy face. So you have to be careful. We are asked to have faith, but we are not required to be credulous. The Church usually does exhaustive research before pronouncing on what are called 'private revelations'. 

A smart Catholic would abide by the phrase 'by their fruits shall ye know them'; i.e. what comes of the phenomenon?

Is the visionary profiting personally from the phenomenon? Are they to the forefront, like a pop star, or are they humble? Are they asking for money?  Do their revelations contradict the Bible or the established doctrine of the Church? Do they bring agitation and discord, or do they bring peace?

"His ways are ways of pleasantness, and all his paths are peace."

An added problem in these liberal times is that it's hard to know the path of righteousness; our grandfathers would be shocked at how little time we spend in religious practice, and how casual it has become. 

The answer I think is to hark back to what the saints of the Church did before the 1950s, even back to before the late 19th century, and do likewise.

Lastly: I confess I'm not putting up these pages out of pure charity. 

I figure if I can help get you and a few more through the Heavenly Gates, the Lord will take it into account when my own turn comes for Judgement.