This tutorial will be able to help you and give you an idea as to what you are about to attempt.....
Please be advised that you should have experience is performing these type repairs before attempting this. If something goes wrong or you get stuck/something breaks, it cost you much more than it should, if you have just let a repair facility take care of this for you.
97 camry 2.2 oil pump leak? is this common?
Yes it is.
what seals the pump?
There are 2 seals, one is a normal looking seal and the other is a formed o-ring seal we call a racetrack--because thats what it looks like.
does the pump need to be timed?
does anything else need to be timed?
No, just the timing belt.
what is the adjustment procedure for the new belt
Just put the belt in time and then let the idler bearing loose to take up the slack. You can apply just a little pressure upward with a prybar before tightening the idler down.