You've all been helping my retirement plan, but I noticed something...
I have been contributing to a PRE-TAX 401k, but it looks like I have a ROTH 401k and AFTER-TAX 401k as options too.
This is all through Fidelity.
I am 29 and I make about 140k a year.
My retirement plan is currently set aside 15%
1. Get employer 401k match
2. Max Traditional IRA
3. Fund 401k more
4. If needed, fund HSA
My salary will continue to go up over time (maybe not a whole lot more though).
I have about $30,000 in my PRE-TAX 401k currently.
I can afford to pay taxes if I roll over to ROTH 401k.
Should I roll over to ROTH 401k and start using that instead of PRE-TAX 401k?
Anything to be aware of?
If I roll over, how do I pay taxes? Will TurboTax help me with that next year?
Thanks bogleheads

EDIT: It looks like there is no income limits on the ROTH either. And if my salary continues to go up, my taxes will be higher later in life, so it's better to pay the tax now and use a ROTH right?
EDIT2: I'm single, I have a full emergency fund.