It wouldn't hurt to put a little bit of petroleum jelly on the neck of the filter. It makes it easier to get out the next time. Otherwise its very easy to break the neck and thats always fun to get out.
Also, if you have to get a new rubber gasket, and you can't get the new one to seat because its all curled up, if you don't have RTV handy, you can ALSO use petroleum jelly as well for that. Just a very thin layer will make it stick. I have been told this by the GM garage that it will not cause any seal problems and makes it very helpful.
Like said before, make sure you clean the pan very throughly. Taking it inside and washing it and drying it doesn't hurt. Doing the same to the magnet. Also, make sure that the bolts and bolt holes are clear of any small debris like dirt or sand because that will prematurely wear the bolt holes in the very soft aluminum transmission casing. Just maybe clean them up with some WD-40 and a rag. I doubt this is a crucial step, but it never hurts to be careful. Also this will help you torque your bolts more accurately if there is no debris in the threads.
Also hah, if you've not done one of these, your arms and neck will get very stiff and sore.
Also, those bolts are MURDER on your fingers. They get to a point where your ratchet is useless and you have to use your fingers. I recommend some gloves or something. My fingers had calluses from them
Also make sure you have a pan wide enough to drain the fluid without spilling it everywhere. And make sure to have LOTS of newspaper down. It can become a mess REAL quick.
Off topic side note for the gearheads:
I have 19 pan bolts. Does the 65e have only 12? Just curious. I would automatically assume that the 60e has 19 as well.