Piece of cake. This thread
has some good advice, but it's really pretty straightforward. That's a good writeup BTW...
You definitely want a new sending unit with a new collection tube filter while you've already got the tank out. The new sending unit won't necessarily correct the gauge issue. HOWEVER, do not hook up current to the sending unit without hooking up the Ground wire first! You will cook your sending unit and that will just suck. The gauge issue is another thread for another day, right?
Best advice one could really offer here is get that thing as close to empty as possible before attempting to remove it and use a jack so it can be lowered a little bit at a time, some of those hoses will hang up and you can't get to them immediately. Otherwise, just put it back the way ya found it, ya know?