I single hand my 48 most of the time. I don't need to expand much as most of what I would contribute has already been said by Pascal and others. I would emphasize the following. First, you will learn to have a plan before you get there. Does not mean you can't change the plan, but its a rare day I don't know my #1 & #2 options before they happen. Once you start truly, honestly considering all your scenario's before you enact them, you will find its the rare day that you make a fool out of yourself.
Second is that over time, I'm a pretty big stickler about not leaving the boat until I have a line tied. I've left the boat with only a stern line on, but that leaves me an easy path back on board if for some reason I "lose" the bow. Yes, this will cause you to re-think a few things. I've also gotten quite good at hooking spring lines from my walk around, again not leaving the boat. I also tie the boat so I can loosen all the lines from the boat when leaving. Sometimes that means I completely re-tie the boat before I leave, but I almost never have issues getting away, even in close quarters.
The not leaving the boat until tied rule will cause you abort a few more landings, but I strongly suggest not risking otherwise. The longer I do this, the more I am a stickler in not taking the chance. Had one too many close calls. Also, while you will be in a hurry to do things, don't. Find ways to slow the situation down so you can take in information before you make decisions. It's amazing how few situations require you to really run anywhere if you just minimize the necessary jobs and figure out how to take them one at a time. Get that one, strategic, necessary, perfectly executed ONE line on first, and everything after that can go at its own pace. If you need a SHORT stern line so you can pivot effectively, don't get in a hurry and allow it to become a medium length line (which throws your stern way out from the dock when you realize it was done at an angle in a hurry). Don't trust bystanders. Accept help, but verify everything.
Emphasize quality over speed and you won't need speed as much as you think.
Oh....and when its blowing 40, you had the dingy ripped off the sundeck by a 10 foot wave, there is not a single dish or glass left in a cubbord, or a single drawer left unflung. And you find that your getting blown off the dock before you can even run back and get that stern line. By all means, in my experience, don't be shy in either putting the anchor down for another couple hours before trying to land at the dock, or for that matter, slam the bow straight alongside the dock hard as you wish to buy enough time to get a damn line tied. Only took me an hour to buff the 10 foot long paint scratch off the hull after that fateful winter day. There were not too many others around who would have done better with a crew! I did get the help of an innocent bystander to grab the bow line thank goodness. Anyway, the point is, you can do it and its the rare day where you are just fully out of luck without a crew onboard. It does take judgement and planning though (judgement is more important than raw skill). Plus, if you exercise good judgement, you don't find yourself in the middle of a winter storm in the first place, but its nice knowing that if you do, you still have options, even if they are not the ones you would prefer.
Oh, and nearly forgot, why a stern line when single handing a well placed spring is almost always a better idea? Because on my boat I have safe access to the swim platform which is at dock level. Many of the docks around my parts don't have cleats. I can grab a cleat from the walkaround, but if its just a bolster (a bar or maybe a 6x6) you tie to, there is no way to easily get that. From the swimstep I can loop a line quickly on the stern without leaving the boat. If I had a cleat i could grab, I would not do the stern line in most cases.