I imagine it is just a case of drain oil, unbolt the sump, remove the old gasket and make the mating surfaces as clean as possible before installing the new one. I would consider a thin smear of gasket sealant if you want to go over the top and then carefully tighten the new sump bolts up making sure you evenly torque them down and not over tighten (I imagine the torque settings can be found easily enough.)

Refil and check oil.

Not done a 2wd engine YB before so don't fully know but it is just an old pinto at the end of the day.