Getting the transmission back in by yourself can be a PITA. Try to find a friend to help. If I pull the tranny with the engine still in the car, I try to get the car as high off the ground as possible via jack stands. While laying on my back on my creeper, I have a buddy lay the tranny on my chest and then I roll under the car. I press the tranny up (like a chest press) and stick it in the hole. It will take both hands to hold it. Have your buddy start the bolts. What ever you do......do not use the bolts to pull the tranny in. You need to get it pushed in by hand. If not, you take the chance of damaging the input shaft or pilot bearing.
Oh yeah....make sure you have a clutch alignment tool. You will need to align the clutch disk before trying to install the tranny. It is not that hard if you take your time and have a friend to help. Good Luck!!