I would not shoot this at a wedding, it's WAY too slow for anything indoors, forget it.
The reason I'm shooting this, it was given to me and I'm unemployed and can't find a job and this is pretty much all I have left now.
OK, I feel your pain. I've been officially without "job of substance" since 2005. For over three years I've been living with aging parents to take care of them; Dad died a year ago and Mom is on her way. Money has been tight, I assure you.
Free film does not necessarily make good value. You still need to process it, whether to negs and scan or all the way to prints. Either will cost you as much or more than any non-professional film.
I just bought some Ektar 100 on eBay for $4.25/roll, free shipping, in date. To do some C-41 processing testing, I bought some Fujicolor 200 under the Walgreens/CVS branding; four rolls of 24 exposure for $8, i.e., $2/roll. Even compensating for the 36-24 exposure difference, that's $3/roll. Far less than any processing to negs only, at least that I can get in Sarasota, Florida.
Your original question is best answered by, you know, actually shooting a roll. When you've done that, let us know how it works out. It might be fine, it might not, and you will be living with 25 ISO regardless.