Sean, the thin paper gasket under the oil pump and under the oil pump cover will usually seal any leaks where the bolts(studs) are. Stock cases have studs there FYI, not bolts. The washer and nut on the outside cover can be sealed by a smear of oil-proof Permatex silicone.
I didn't think there was enough room in the oil pump for a 10mm stud or bolt, that's why I suggested a Time-cert.
And yes, you need a thin paper gasket because a thicker gasket will allow pressure to bleed past the ends of the gears.
In order to pull an oil pump, it is usually necessary to loosen the two case studs, one above and one below the oil pump. That should allow the puller to get the pump out without destroying the pump or the puller. Sometimes, when using a puller, you put tension on it, then smack it with a hammer. Sometimes, this jars the pulled object loose. But not every time, some really won't come out without splitting the case.
Get that Bentley manual, there is a ton of information and pictures to help you. Plus thread sizes, torque and wear specs........