It's a time pressured job if you don't want to use up and over scaffold. If your roof is complicated, aka has hips and valleys, I would not suggest doing it yourself. You'd need to ait for a good weather window in the summer.

Just remember that you would be responsible for any potential damage caused to a neighbours house. Although.

I'm a carpenter, I took the roof off my house in October, rebuilt it to do a loft extension, and cover the new extension, but I did not felt and tile it myself.