Bring friends.
Be patient.
Be organized.
There are two wires on top of the trans I would mark which is which (when you see them you'll know what im talking about) so you don't cross them on re-installation. I don't what happens if you do but its easier to just avoid finding out.
Make sure you have all seals, gaskets, grease, trans oil, boots, etc. that you need. It's a good time to just replace all that stuff.
The top right bolt of the trans I found was easiest to get to from the top. I just unbolted the tab that keeps the hard lines in place and moved them a bit to the side, and bam instant access. Worked for me at least.
Don't over grease the spindle area of the trans. I had a friend do that and it ruined his clutch.
Basically what everyone else has said.