How to approach studying precedent materials- feeling overwhelmed

So I am currently approaching the end of week 2 on the job. Have been taking my time with training and spending time at home reviewing notes and going through practice several times, trying to get efficient with shortcuts, etc, printing and reviewing the presentations that we went through, etc.

I've had limited modeling experience in the past, and as such I thought I would take time to study previous pitches and deals that we worked on. However, upon inspection I see 40+ revisions of models, each with 15-30 tabs however, and just feel lost when looking at them. DCF, LBO, operating buildouts, comps, hidden rows and columns, thousands of rows of data, etc. Is there a specific part of these files to focus on in order to gain more familiarity? I understand the functions being deployed and general structure of parts (like on a P&L statement and projection, how it pulls in sales, cogs, sg&a, opex, etc from the financial statements and uses revenue growth and common size assumptions to go forward) but if I actually want to go in and rebuild these as practice, what should I do?