You have gotten some great advise here. I use a two piece pouch system so the barrier comes in a package that you peel back the top paper. I have cut the hole with that paper still attached and when I pull it off, I keep it and it is my template. The next time, I tear the top paper off and place the one that I cut the previous time onto the barrier and draw the outline of the hole with a pen onto the back of the barrier. Then I cut it with scissors and it fits perfect every time. I keep the one and use it over and over. Your stoma may change shape after it heals. Mine went from a perfect little round stone to a slightly oblong stoma. So don't be afraid to adjust for that. I keep all I need, scissors, pen, and template in the box the barriers come
in. I also write the date I change my barrier on the top of the box. Nice to keep track. Sometimes I just forget to change it and unless something happens like a leak or coming loose, I will wear a barrier on average 10 days. I have gone 18 days just to see if I could! Lol
Glad you found this site! It is so helpful!