Its your build do as you see fit, but before you mount up the oil pan make sure you take a few minutes to carefully examine both gasket mounting sufaces. If you see or feel any irregularities in the mating surface that the gasket is making contact with, you can address them. Its just one of those attentions to detail you spend in order to assemble it and not have problems, I carefully inspect for high spots and then lightly stone away just the high spot in question, any type of recess may require a sealer, ultimately its up to you. I've never used sealer on an oil pan gasket, make sure its clean and smooth and then just install, after a few rides or at your first oil change recheck to tightness. If your going to torque these fastners you better have a recently calibrated wrench, the value on them is so low that there easy to strip if your using a torque wrench. Like many here, I prefer to hand tighten and recheck after a time of riding. Be patient, have a plan, it'll be fine...