That's a nice little project you have there. I'm no professional but I wanted to share some things that help me. This site and the awesome members here is invaluable. There is a wealth of knowledge available, just do your research. Spend a little up front on the right tool for the job, you won't regret it..
break things up into little manageable projects even if they are as simple as sanding a panel or removing a single part. I like to make checklists for each section I am working on and then for each item on the list, sit quietly and think your way through the process. I know this may sound silly but in this way I can anticipate problems, ask questions, and round up materials I will need instead of waiting until I start the project only to stop midway.
Don't rush any project or task. Fit and refit, sand carefully, measure repeatedly, think three steps ahead and learn from your mistakes.
I like to prep each piece by sanding or blasting them, then epoxy primer, then sand off only the areas to be welded, and go back with weld thru on these areas. After final placement and welding I give another coat of epoxy primer and then look for seamsealer opportunities. That's just my method and everyone may do things a little different. The pros on this site know how to do it right..
Good luck and don't give up.