When rolling out the old bearing and rolling in the new one, use a small cotter pin in the oil hole to catch the bearing. Find one with a small enough head to just fit into the oil hole, and bend the legs out 90 degrees from each other about 1/2" down from the head, then cut them at 1/2" to wind up with a T 1" across and 1/2" tall. You may have to bend it at an angle to match the oil hole as well, you want both legs to sit flat on the journal surface.
Once you make the pin, just unbolt the main cap, find the oil hole, instert the pin and hold it in place until it contacts the bearing, and then keep rolling it around until the bearing is out. The new one rolls in the opposite way. The thrust bearing is a major pain, the last one I did I had to assist it most of the way with a flat bladed screwdriver.
For the rods, you should get some thin 3/8" tubing to put over the studs while the cap is off so you don't nick the journal with them. No rolling needed, but pulling the spark plugs is a good idea. Just unbolt the cap, install stud protectors, push the rod up until you can fish the bearing out, install the new ones and put it back together.
Use assembly lube on the bearing faces, but make sure the bearing back and bore in the rod or block is clean and dry. This is hard to do on the upper side of the mains, but a shot of carb cleaner and then letting it dry or blowing it out with clean air usually does the trick.

Usually a loose flywheel will rattle and also it'll scrape the block plate making a whole bunch of noise.