The only "tip" I can suggest is each time you do a particular job, use it's useful to have a torque marker handy to mark each tool you use for the job as you use it. Then you have an easy way to identify everything you need to prep before you start (e.g. 10mm ratchet or whatever was missing.) Also a checklist for completed tasks as part of a build sheet. It's also value-add to hand to the customer so they can see the 400 line items and see where there money went. Running a camera for the whole build is also a great peace-of-mind and something I think I should be doing as a record for quality.