The type of kayak that you use does not matter. When the lesson is finished you will be free to use the kayak of your choice. So let's say that by now you have mastered paddling strokes and skills but you need to learn how to get into and out of your open-cockpit kayak. If you are lucky the instructor of your course will be able to teach you. If not you will have to teach yourself.
Some kayaks even come with a brief instructional section in the owner's manual.
Practice the technique from your guide in water close to shore. Do no go far off shore until you have the ability to get into you boat from deep water consistently. Backrests, knee straps and a paddle leash are the only pieces of gear that may pose problems. Fear not, they are easy to figure out as you go along. Experiment by tightening and loosening the straps on back rest and knee straps to fit.