I guess I'm the exception. I like to do the DIY projects and get great satisfaction from their completion. Since I'm human I have made errors in some of my projects by not thinking it out fully before starting. Adding on to my 17' Horizon was an error free project that we have enjoyed. Adding a separate 120volt circuit for my Inverter was a great success also.
I commented to an on line friend today that I was anxious for a new project.
The most important thing I find is that you must have a well thought out solution as to how to accomplish the task at hand. You can't go in blind and play it by ear in most cases.
antiquedrose, I remember in 1986 I had a new 33'Shasta MH and was 1000 miles from home and the window beside the bed leaked and wet the mattress. I pulled into a CG and drove my Toad to a Big Box store and bought a large cheap tarp and several tubes of sealer and a gun for the tubes. Came back to the RV and In the rain the wife and I draped the tarp over the top and she held it out while I removed the entire window, cleaned everything up, re sealed and put the window back in and then caulked around it. It never leaked again.