Here's a link to what I consider the best post-surgery suggestions, tips, hints, and things to make it go right.
Hope there's some good ideas there. Regarding the catheter and the penis, use Neosporin or similar around the tube to keep it lubed and fight germs. You will find that you can pull the penis back down the hose somewhat, then put the antibiotic salve on the tube. When the penis is back in position, the inside is also lubed, giving much more comfort. Anothr idea is to really tape or affix the tube to the shaved thigh, maybe in a loop, to keep the tugs and pulls of normal movement from irritating it.