Easiest way.....put a ratchet with correct size socket on the crankshaft pulley bolt. I can't remember the size....19mm maybe? Turn the crankshaft till the timing mark aligns with the TDC mark. It's hard to see but can be done from under the vehicle with a bright flashlight. A mirror might make it easier as well. As long as your harmonic balancer is in good shape and hasn't slipped, you'll be at TDC on the compression stroke. Remove the cap from the top of the OPDA and the alignment holes should be in alignment. If they are off, your harmonic balancer may be off and if so, you'll have to do it the harder way. Remove the #1 spark plug and drop a longer dowel type rod into the cylinder. Turn the crankshaft till it clearly is at TDC and look at the OPDA. Are the holes lined up? If not, then you're at the top of the exhaust stroke and need to turn the crankshaft to bring it into TDC on the compression stroke again.
As far as the screwdriver to rotate the oil pump drive.....it's super simple. Look at the end of the OPDA where it goes in the engine. It kind of looks like a big screwdriver. That's what you are turning with a flat head screwdriver to rotate it. I would rotate it 1/8-1/4 turn at a time till it all lines up. The oil pump isn't timed like the OPDA to the cam is so the OPDA "screwdriver" just needs to smoothly mesh with the oil pump.
Don't let it intimidate you. If you do it this way, it'll line up perfectly and work properly.
The best way to loosen the hold down bolt is with an old school distributor tool. If you don't have one, a wrench will work but be a little more difficult to access.
The sharpie line on the two units will just help you ensure it's in the exact right spot.