I have used a bridle of sorts for making that tight squeeze into my previous slip. I ran line from both of the rear pilings to a center point forward in the slip. This created a "V" into which I could simply point the boat and rest assured that the bridle would catch the boat. I thought of it as training wheels until I got used to getting into the slip.
For getting out of the slip, I have often times had to put a line on a cleat near the midsection, and make a wrap or two around the rear pilings in order to pivot boat-- especially in high winds.
Of course, you could always get a bow-thruster and never have to worry about any of that!