I'm about to finish my DWV install by taking the vents through the roof. I have purchased some Oatey plastic roof jacks w/ a rubber/neoprene boot that goes around the pipe.

Are there any secrets/tricks to:
1. cutting the hole through the roof (I'm assuming I want the hole as small as possible w/minimum impact to the shingles?
2. attaching the roof jack?
3. getting the roof jack layered under the shingles (do I just stick the top under the shingle above the vent and lay the sides and bottom over the shingles?)
4. sealing the roof jack at sides,bottom, top, fastener penetrations?
5. sealing the roof jack around the pipe?