Hermie, Yes you can ask for vectors to your point of destination but depending on what kind of airspace you are in and how busy the controller is ATC is under no obligation to give you that vector. If you are outside controlled airspace and the reason you are asking for a vector is because you are "geographically unsure of position" then obviously ATC will do everything possible to assist you if they can. Remembering of course that cloud and terrain clearance will always be the responsibility of the VFR pilot.
Keep in mind also that if you are considering using vectors to make it easier to get around the countryside on your VFR Nav exercises instead of using the DR techniques your flying instructor has taught you then that can be fraught with danger. Remember, not all the airspace that you fly in will be under radar coverage and the best controller in the world will be unable to help you if he can't see your paint on a radar. DR, 1 in 60 and your ever present whiz wheel will keep you out of more trouble than ATC can ever get you out of.
Not to say that ATC won't help when they can, just remember the only person you can truly rely upon when you're the PIC.