The only mistake of the procedure is that if you don't have enough info you should ask for help before. This is very common and I have done that so many times to understand it's a waste of time. The only exception IMO is when you really need to understand certain parts of the codebase at a very low level so spending time solving things by yourself it's well worth as an exercise and helps a lot. If it's a part of the codebase you're not likely to be working on any time soon, just don't do it. Talk to whom reported the bug and also talk to the last person that worked on that piece of code (git blame is your friend here)