Sure thing! Yeah the type I cert is an easy choice, same as 609 MVAC. If you’re considering the trade, you might choose universal (I, II, III) to save time. Exam is longer, closed book, and proctored, but not hard.
Among skilled trades, HVAC is notoriously demanding physically (especially residential, where you’ll spend a lot of time in attics and crawl spaces in hot weather) but consensus on hvac forums is that pay’s good and you’ll never be out of a job as long as you take care of your body.
You’ll need to pickup 608 type I certification to legally buy most refrigerants. It’s inexpensive, the exam is open book, and takes an afternoon to complete.
The “textbook” used is actually a useful reference if you’re just starting out. The material familiarizes you with common terminology, regulations technicians must follow, and the procedural basics for typical jobs, but the emphasis overall is how to handle refrigerants safely and avoid venting them into the atmosphere.
Oh man, when the hiring manager says “not at first” with that sing-song lilt, the adrenaline hit was immediate. 15 years later and this still gets to me.