If you single-hand and can dock bow first a handy docking aid is a permanent spring line hung on a pole at your slip. A lot of people in our marina use these as it's often windy here.
The line is fastened to a cleat near the outside end of the finger you're going to dock against. The loop end is hung on a pole about a third of the way into the slip. The length of the line is such that it will be tight from the cleat to your midship cleat (assuming you have one) when the boat is the correct distance into the slip. The height of the pole is such that the line can be easily picked up by someone standing on the fore or side deck.
In practice, what you do is enter your slip and as your foredeck comes up even with the line hanging on the pole you step out, lift the loop off the pole, walk back and put the line through the midship hawse and onto the midship cleat. You then go back to the controls and ease the boat forward until it takes up all the slack in the spring line. Leave the boat in gear and the line will pull your bow into the dock. At the same time put the rudder hard over away from the dock and the prop thrust against the rudder will move the stern over against the dock. And you will be pinned there alongside the dock at which point you can step off and secure the bow and stern breast lines.
Get back aboard and put the transmission in neutral, center the rudder, and shut down the engine. You can then adjust your lines, add more of them, etc.
We use our permanent spring even though there are two of us on the boat because this way the wind has no chance to blow us across the slip into our neighbor. We've used this technique to pin our boat against our finger in 15 and 20 knot crosswinds that were trying to blow us off.
While not real obvious on this photo, you can see our line hangar (made of PVC) just forward of the boarding gate in the starboard rail. When we're in the slip we use the permanent spring as a second aft breast line since the prevailing storm winds come from behind us. There are no other boats in this photo as we were one of the first boats to move onto this new dock which replaced our ancient old wood one. All the slips on our dock are now occupied.