Tie a line to your bow cleat and run it to a dock cleat astern, fixing the other end on the dock somewhere aft of amidships. The farther aft the better. Now ease the boat foward. As the line comes tight, the stern will swing seaward - you can turn the wheel toward the dock to help this along - until you are bow-on to the dock. Release the line and back away This may require some scurrying if you're alone. With crew aboard, assign someone to "tail" the spring line. That is, instead of hitching the line to the cleat, a crew member takes a couple of turns around its base, tending the line by maintaining pressure until you give the signal to release it.