I had a small bowel resection and could climb stairs by the time I left the hospital (albeit much more slowly than usual and it took a lot of energy!). My advice would be to try not to go quickly - even if you think you're taking a ridiculous amount of time just to climb some stairs, take it one step at a time (rest on every step if you need to!) and be guided by your body. If anything's painful or out of the ordinary, stop and ask for some help.