Potty Training

My son is 22 months and I am going to try to potty train next week while on Christmas vacation. This is the day I have been dreading since I found out I was pregnant and am dreading with the next one too. I just don’t even know where to begin with the potty training. I’ve heard some say use a timer and set it for 20 minutes, every 20 minutes you take the child to the bathroom. How do you or the child do anything? I can totally see Jackson getting angry with me for interrupting his play time every 20 minutes. Also do you believe in pull-ups, the plastic underwear, or do you just go cold turkey off of diapers? What about night time training? I have a friend who is potty training her 2 year old son and she took the diapers away, period, he doesn’t even wear anything at night. She said she has changed a lot of sheets. I just don’t want to do that, plus I don’t want to ruin a mattress. I have another child on the way and that mattress has to last. Oh my, oh my, how I’m going to do this.