You’re on the right track thinking about taxes-the key thing is making sure you do a “direct rollover.” That means the money moves straight from your old 401(k) provider to your new IRA provider, without you ever touching it. If you get a check made out to you, that’s when taxes and penalties can sneak in, and you definitely don’t want that headache.
Usually, your new IRA provider can help handle most of the process and even initiate the transfer paperwork. Pro tip: call both providers and get them on the same page; sometimes you’ll need to play messenger for a signature or account number, but you shouldn’t have to move the money yourself.
And as for transforming into a responsible adult-rolling over that orphaned 401(k) is as close as it gets to feeling like one. Everything after that is just pretending confidently.