All those years when you could have been using it..... Never mind, with the 4425 (I assume) with its floating inputs, ‘future proofing’ and outstanding automotive and diagnostic software, you’ll soon see it as one of the best decisions you ever made.
Can I suggest 2 video tutorials made by that excellent fellow ScannerDanner?
Part 2 taught me a lot because despite my having used oscilloscopes before, I’d never properly understood some aspects. So Part 2 is definitely worth watching now, and, after a while, it’ll make even more sense. So well worth watching more than once.