How would you advise I go about gaining more valuation practice?

I have no affiliation to any of these, but Wall Street Oasis, Wall Street Prep, and Training the Street are all good ways of getting more comfortable with valuation work. Wall Street Oasis is an online forum for finance professionals and has plenty of materials for aspiring finance professionals, including valuation materials. You may be able to find free and more practical training materials there (vs. more theoretical). At the end of the day, however, keep in mind that valuation work is something practiced over time. If you’re valuing an actionable target without plenty of comfort with it, I would be conservative in your assumptions and cautious not to lend any outputs that stray away from reality much weight (or capital).

Does anyone have any experience with another training company called Wall Street Prep? Looks similar to Training The Street.