I think that the way I psyched myself up to bm right after was reminding myself that my uterus was too swollen from pregnancy to move down. Lol that was my fear...that my uterus would come too far down. Also just remember that women have been doing this since the beginning of humanity, and you can do it too :)
Try not to push hard, just tiny clenches, ease it down as slowly as possible. I had a BM within hours of my daughter being born and I had 6 stitches. It's totally fine.