I also had a right hemicolectomy. I agree re adding foods gradually, sticking to small meals, etc. I think I stuck to pretty much the portions and low residue type of food I had in the hospital for about a month, then started to broaden a bit. I used it as an opportunity to lose some weight.
Unlike you, once my bowels started functioning after surgery I had ongoing diarrhea and loose stools rather than constipation, mostly because of the metformin I take. Make sure you drink plenty of fluids. If you are constipated, use the gentle type of stool softener and laxative they send you home from the hospital with, in my case GeriCare docusate sodium and GeriCare Geri-kot, which is senna.
See what agrees with you food-wise, and what doesn't. It's probably a good idea to avoid nuts and seeds for a while longer, though.
It is normal to have some pain around the area on and off in the months after a colectomy, especially if it is open surgery. If the pain is really bothering you, call the office of whatever doctor is doing your follow-up and tell them about it. Or use My Chart to send them a note.
BTW, I live in Maine, if that's what your user name refers to.