Cutting joists in place can be a very dangerous job with a power tool
of any kind, so be careful. Believe it or not, I've had good success
using a japanese crosscut saw. Its much more suited for the job
because you pull it, instead of push it. It doesn't really take that
long. I had to cut off a 3 x 12 beam sticking out at an angle in a
tight location. I would have killed myself using power. The handsaw
was the answer.