If you are using heat when washing, you should always unwind the hose. Otherwise heat will build up and cause your hoses to fail faster. Some say that even with cold water you should unwind the hose to lessen the strain on the hose and the reel.
What you're asking is for someone to hold your hand and all but do the work for you. You're not going to learn much that way.
You're going to make a few mistakes, but that's the best way to learn. If something you do out there doesn't work very well, don't do that again! And move on. Lesson learned.
There's no way to tell you all you need to know in a post. In about 20 years, you still won't know all you need to. Not trying to be mean or anything, those are just the facts. You'll start to learn stuff, and become more confident over time.
Trust me. One year ago, I knew NOTHING. This was all just an idea.
Do alot of reading. There are very informative posts here on this bb, as well as others. All you have to do is find them. There are informative articles elswhere, (i.e. the library), and instructional videos.
The learning NEVER stops, H2O. You should get started.
Park farther away so you don't get your truck wet. Just pull it straight out and leave as much as you do not need for the job inline with the reel. That way you can just roll it up fast and easy when you are done.
Or do not have it all on the reel unless you plan to use it very often.
Two hundred feet on my reels. Rarely use more than 120'. Hot water, cold water, high pressure, low pressure.. same hose for 4+ years.
Reeling and unreeling hoses takes a toll in both time and energy. The less you have to do either the better. Hoses are a very small expenditure in the gist of things. This is one issue I would not worry about.
It depends on the quality of the hose. Some of the lesser hoses will expand and crush the hub of the reel. I know, I have seen it and done it. Personally, I use higher pressure hose, and I use my machines a lot. I seldom fully unwind my hose reel. I Just use what I need.
I'm asuming you're using (2) 100' sections of hose coupled together, all wound on the same reel? We do the same thing, as well as 200' on the water supply hose reel. However, the less hose you actually use, the better. More length of hose used makes the pump work much harder than it needs to.
When we set up, if we only need 100' of hose, we uncouple the sections and couple directly into the machines. If we have a small area that requires additional pressure hose length, we couple it to the remaining hose on the reel and finish it that way, or use a 50' we always have in our rigs. When you're done, recouple the hoses on the reels & wind up.
I've found that even when you lock in your reels, you still end up pulling some of the length of hose out to get it tight again. Also, when using hot water, your pressure hose will heat up & burn the grass. We try to leave as much as we can on pavement, and move the hoses around as often as we can. We've learned to tell the customer they may have some burn marks when we're done, but the grass root isn't affected. so it will grow back. If it's a really dry summer, it's hard to avoid. Telling them upfront will save you some headaches later. Good Luck!
also another thing to consider,your reel could break in the center from pressure ,i have had a cox reel that was supposed to hold 350 to 400 feet of hose and first it became out of round(wabbling)then the center broke ,i figured it was because i left the hose on the reel and the combination of heat and pressure as well
My supplier told me that if the hose is moving at all then the unloader is set too high. He adjusted my unloader and that problem stopped. He then taught me how to adjust it. also, my reel began to wobble, I learned that the srews holding the little "tube" inside that the hose rolls onto, they were rusted and one was broke. I replaced those and have had the reel for years. I replace those every year.
I keep one hose (100 footer) on the reel and all the other (50 footers) coiled in the trailer. I only add hose as needed. My supply hose & reel has just over 200 feet. I had rather run that out and be further from the water source and closer to the work area.