I drive a MH but in general the principles are the same, I think. This is what I do:
Learn to visualize, with practice and experience, where the rearmost wheels are located relative to the space.
Pull forward to the point where the rear wheels are near the point where you want to begin to make the turn into the space. Normally pull forward no more than a few (3-5) feet ahead of that point. Stay close to the side of the driveway that the space is located rather than the opposite side (which alot of folks think).
With this in mind, begin to make the turn immediately to direct the vehicle into the space. Usually try overdoing the turn and assess quickly whether this is enough to direct the unit into the space (getting out to take a look is not a bad idea)
At some point here pay attention to where the tow vehicle is relative to obstacles that might interfere with the ability to complete the manuveur.
Yes, sometimes this sequence takes a couple of tries untill the obstacles present are assessed, and adjustments made.
The more practice the better so if this is really a problem, go to a place where you can set up cones or whatever and practice.