St Therese of the Child Jesus (who is a doctor of the Church) has taught extensively on Purgatory. She teaches us how to avoid it entirely and go straight to heaven. Father Dr. Hubert van Dijk has written a summary of these teachings. They are really worth studying. Read the teachings carefully until you understand them and review them from time to time. Apply them. You can find Father Dr. Hubert van Dijk’s article on the teaching of St Therese on Purgatory at the following location:
Please avail yourself of this teaching.