how do I get the oil pan off to replace rod bearings

That's NOT how it is done!! .. All that work will turn out to be a waste of time .. The new bearing running against the scoured crankshaft will be destroyed in only a few minutes - IF it last that long! .. However you do as you please, I'm just trying to help.. Good luck!

Not to be nasty, if you need to ask that question there is a good chance you shouldn't be attempting this repair.