Time to address some issues - Are these beyond shade tree mechanic status?

[Best4x4xFAR]

So our X5 is rolling up close to the 200,000 mile mark. And the oil leaks are getting pretty bad (It is going though almost 2 quarts of oil per tank of gas now)..

• Oil Filter housing gasket - Assuming this is the main source of the leak, given its frequent occurrence (unassuming I just need to do the gasket and not replace the whole oil filter housing?)
• Valve Cover Gasket (I'm seeing oil on the exhaust heat shield)..
• Oil Pan Gasket (I hear this on is a real pain because of the drive axle, and not having a lift is going to make it a pain as well? Could likely put this one off for awhile.)
• Thermostat/Water Pump/Hoses/Accessory Drive belt and tensioner..
• Coolant Overflow Tank..
• Air Injection Pump (loud high pitched whine for 15-20 seconds on start-up in cold weather)..
• O2 Sensors (this doesn't look too bad?)

Anything beyond driveway mechanic status? I've turned wrenches for years, on various cars, and I've tackled several things over the years, but I am no trained mechanic by any stretch..

Any advice for me before I start ordering parts

Or should I be asking about good Indy shops in Baltimore area?