1. DO NOT destroy your originals. big mistake. make a copy of the library before you start.
2. Do training! Its not like Word where you can muddle through.
3. Practice for a few days at least, maybe weeks, with a few specific photos. Do them again and again until you get tgecresults you want. Examine them critically and print them if you have a printer. Only when you’re happy, move on to the bulk of the files.