The three best ways to eliminate Purgatory that the Church has given us are:
1. Receive Extreme Unction
2. Having prayed for the "Plenary Indulgence in Articulo Mortis"
3. Kissing a Crucifix blessed with the Apostolic Indulgence at the moment of death (or if unable to, someone is to place it in your hands or on your chest)
Every Catholic should have already prayed for the Plenary Indulgence in Aritculo Mortis and had a crucifix blessed with the Apostolic Indulgence (and while they're at it had the priest touch the Crucifix to a relic of the True Cross and also bless it for praying the Stns of the Cross).
Having availed yourself of the Church's help listed above, it is imperative during this time of final perseverance to remain in a state of grace as the devil may increase temptations during your weakened state. The two worst temptations at this time might be presumption (in that you're done all to prepare yourself) and despair (that you've been deceived and somehow messed up). Recognize them as temptations only and don't fall for them.
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Some helpful ways to stay in a state of grace:
Accept and offer up (especially through the Sorrowful and Immaculate Heart of Mary) all your physical, spiritual and mental sufferings in reparation of your sins.
Invoke the Holy Souls to pray and intercede for you and in return obtain for them many indulgences, especially plenary that you can't keep for yourself.(you can only keep one per day for yourself). The Holy Souls' prayers are powerful before God.
Pray the Stations of the Cross, the most highly indulgenced devotion of the Catholic Church by which you may earn MANY PLENARY indulgences, Totis Quotis (every time you perform them)((you must have a specially blessed Crucifix for this so have the priest bless it for you, no special formula is required he need only form the intention. If no priest is close, have someone do it for you or mail one to a priest and have him mail it back)
This devotion is the oldest of the Church and was performed daily by Our Blessed Mother.
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Pray the Rosary, specifically the Seven Sorrows Rosary, having compassion on Mary's suffering.
Throughout the day especially when tired, pray just short ejaculations:
Sweet heart of Mary be my salvation
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Most Sacred Heart of Jesus I place my trust in Thee
Hear of Jesus I adore Thee,
Heart of Mary I implore Thee,
Heart of Joseph pure and just
In these three hearts I place my trust.
St Joseph, patron of a Happy Death, pray for me.
NOTE: To pray the Stations of the Cross at home the instructions are VERY specific to gain the multiple plenary indulgences.
You must have a blessed crucifix for that purpose which you must hold while praying them.
First pray an Act of Contrition on the crucifix
You must pray 20 sets of Paters, Aves and Glorias.... 14 sets for the 14 stations, 5 in honour of the 5 wounds of Christ and the final set for the Pope and his intention.
You can also pray an optional set at the beginning in honour of the Agony in the Garden.
When time is precious, we should use it to our best advantage.