Essentially a gum graft is very simple:
1)the dentist (usually a tal surgeon or a periodontist) cut a small piece of your palate, on the same side than you're getting the graft;
2) he then attach it to the gum (which has been previously cleaned and cut to receive the graft) with threads;
3) place a plaster on your palate and on your graft;
4) recommendation are to eat on the other side, avoid brushing on the side of the graft, be careful when brushing the other side, use ibuprofen if you feel inflamation, also it can feel like a small burn during 3-4 days. We see you in 7-10 days
My personnal experience (gum graft on the right side):
1)everything is done under local anesthesia, so I felt nothing at all;
2) when it's started to unfreeze the palate was feeling like a burn, a little more than the so called small burn. However, a few hours later the plaster at the palate droped, (probably because I coughed, since I was producing a lot of saliva and finding a little difficult to swallow). Then, to my surprise the burn impression stoped as soon as the plaster droped. after that during the next 7 days it was sensitive, but that's all. And of sudden, on day 8, it stoped to be sensitive :)
3) at the gum level, it was a bit anoying but no more than that. I took ibuprofen twice (the 1st and the 3rd day), wasn't really necessary, but I did feel a difference, so you should use it. After 6 days it wasn't annoying anymore.
4) As I'm writting this I'm at the 10th day... (I'm in a congress - not the republican one - so I have to wait a total of 14 days) The toughest part now, is to avoid eating on the right side (where I got my graft), because I don't feel the sensitization anymore. Before I find it sensitive to swallow, especially for the palate, even water. I wasn't able to fully open my mouth, because I was feeling the gum stretching (just missing a few degrees, don't be afraid).
Overall, it's in my opinion considered as a minor painless surgery, somewhat uncomfortable, in the aftermath.