I like to insert two machine screws and lay the gasket over them before installation of the plate. This keeps the gasket aligned and makes it a simple one step procedure. With the two screws finger tight I then insert the remaining screws and torque them to proper spec which you will find in your owners manual. If your handy with a wrench you can do this by feel if not you may actually want to use a torque wrench.
You can install the gasket any way that gets the gasket in the right place without ripping it as that is all that really matters.. With paper gaskets they usually go in dry but with o-rings they should be lubed with the glycerin supplied. Default to the manufacturers instruction on the gasket lube or dry situation though..