Jayco,
You do realize that many of us were born knowing all this stuff.
RIGHT ;);)
First, the choice of not having slides was a good one.
Second, not doing things that you don't know how to do will keep you out of trouble.
Third, you seem to be literate and I would guess have an IQ over 80...
That may put you ahead of the people that you might have to pay to do some things.
You said that you learned how to winterize the unit. That is a very good start. That proves that there is more that you can do. So, collect all the documentation for the unit and everything installed or regularly carried. In your spare time, pick up the binder that you put all of that in and read one. If there is some that recently required attention, read that one first and look at the bill. Many of the better manuals have trouble shooting trees in them. If you can understand them, you are halfway there.
Next, buy a tool box that fits someplace convenient in the unit. Buy a collection of tools that you feel you can use. If they don't even cover the bottom of the tool box, that will be a good start. Next time something needs help, look at the book and see if you can figure it out. If no, no loss. But, if yes, think of what you may have just saved.
I do all my own work. Right now, my own coach is up on stands in my barn because it needs some attention. This is kind of a special case because it is a vintage classic and the nearest place that might get it right is 130 miles away. But, the real reason I do my own work is not just to save time and money, it is to get it done right the first time. If it isn't right, I don't have to take it back, either.
Matt