How firm is it to install a lock on a bedroom door? And how much would it cost me for....whatever I would obligation to...

And how much would it cost me for....whatever I would obligation to get?
Answers:    agree to someone do it for you
it depends. if you just want a cuff lock, all you do is screw it contained by. If you want something REALLY secure close to a dead bolt, it is a bit more dificult but can be done by yourself