It would depend on how much your time is worth. I'm not sure how much the FCC Lic. fee is now, but assuming it is say $300 Plus the cost of Business Radio Licensing (BRL) at $155 and rounding it would put the cost at approximately $400 - $450 range. Is your time worth that? Not to mention the pitfalls of filing the app if that is not offered by BRL.
If it is affordable I would have them do the entire process for you, but if you believe you can handle it have them fill out the renewal app and file it yourself.
Good luck