Fidelity agents and reps (in person or over the phone) are paid salaries. They do not get commissions for anything. They likely do get bonuses based off of their customer satisfaction surveys and retention of assigned customers, and any complaints about a rep are taken deadly serious. And there is never any problem for you to ask to be assigned someone else due to a personality conflict or just because you didn't like how they talked to you. Don't consider them a friend; it is a professional relationship with you being the one in control.
Fido reps are not supposed to push you into things. If you ever feel uncomfortable with a recommendation, tell the rep that. They should back the hell off fast, because they'll get in trouble for upsetting a client this way.
At the most, they may recommend their professional management group - Strategic Advisors*, (which does charge a management fee and also will place you in 20+ different funds in an assortment of low/high expense ratios). It is not the worst move ever, but definitely not worth it unless you are insanely busy enough to not care about your money, or mentally unable to grasp basic investing on your own.
They won't push you hard in this direction if you make sure to state you want to learn how to do it yourself. But again, if you get a rare pushy person at Fidelity, tell them you need some time to think about it, and leave/hang up and then make sure to ask for someone else in the future.
The big thing for me is reframing what a rep is actually there for.
My advice is that you should never be asking any rep anywhere for their advice about what funds to choose. You need to figure that out on your own, either by reading and researching yourself, or by asking questions of not-in-it-for-your-money outsiders (like the folks here or on Bogleheads) that can give you specific funds to look at that should fit your asset allocation once you decide what that should be.
You only want to have a rep around to ask HOW to do the things you want to do. Like "how do I sell off this crummy X fund to buy decent Z fund in my Roth IRA and minimize the losses?" or "I need to get $2,500 over to my traditional IRA from my taxable account. Can you walk me through how to do that online?" or even "I need to make sure 15% federal taxes are withheld out of my IRA distribution. Can you help me set that up so it happens automatically?"
*caveat: my dad was with SA for years due to not understanding basic investing, and then becoming too sick to care. When I inherited, I left it with SA for about 6 months while I learned how to invest - I knew nothing. Once I felt good enough about index investing to DIY, I shifted everything out of SA and into regular Fido accounts. My rep was helpful and perfectly nice the whole way through and never gave me any crap whatsoever about wanting to manage my own accounts - he even told me that index investing was a very smart move.