I have an AWESOME secret to help keep your garage clean while doing this...
Save your Amazon boxes. Every so often I get HUGE amazon boxes. There is nothing better to place under your truck when doing this sort of work. It will absorb the fluids that fall onto it.
1. Clean bottom of engine with pressure washer and de-greaser as best as possible. I go to one of those quarter pressure wash places.
2. Place truck on ramps where you plan on doing the work. I additionally put jack stands as a backup under frame members.
3. Run a full 8 oz container of sea-foam in your crank case for 1 hour (don't drive).
4. Leave oil plug out overnight and let drain into your oil pan. This will make a BIG difference.
5. Place your largest amazon box under the truck.
6. Get a couple spray bottles from walmart (they sell for like a dollar). Put simple green in one, and dish soap solution in another. Keep these and rags close-by.
Disassemble and take pan off. It shouldn't make too big a mess if you let the oil drain.
This setup works AWESOME. My garage seldom gets greasy since I started doing this with amazon boxes.
One extra tip, if you ever have the chance buy a military flight suit. I've never found anything even remotely better for doing mechanic work.