I came on this forum 2 years ago when we had the same problem and was inundated with replies and advice from folk whose cats had only 3 legs. Ours, Harley, had one of his back legs amputated after a soft tissue injury which didnt heal. The worse time was just after he came home - very bald and sorry for himself for a week but after that he did just fine, and is still going strong. We were in two minds as to whether to go ahead as he wasnt in the first flush of youth (12) but worked on the principle that as he was otherwise healthy, if it gave him another couple of years in his beloved garden, it was worth it. He still goes out and about every day and night - the only thing he isnt allowed to do is to go out of the front of house. It involved him climbing a fence to get home and tbh, I'm not sure thats not how he injured himself in the first place. Walks very strangely - more of a drunken hop, but when he runs hes fine and interestingly, sticks his tail out sideways to compensate for the loss of the leg. Lots of tlc and yours will be fine too. Someone on here warned against helping him too much as he had to figure out how to do things himself, and it was the best advice ever. Its hard seeing them trying to manage in the first few weeks but they soon get their heads around it. Dont leave too many obstacles around, or too much temptation to jump, and they will adapt quite quickly. Good luck!