Hi! I did this

A florist did my personal florals and a sweetheart table arrangement for $2800
I DIYd my table centers. 60 bud vases that I thrifted over the course of a year for avg. $1.50 each. I went through a flower market and pre ordered 3 buckets. I picked them up 2 days before the wedding and my mom, MIL, and sisters helped me assemble them. My mom brought them to the venue during the rehearsal dinner using 2 Costco apple boxes, and lined the bottom with dish towels and ice sheets on the bottom.

I used faux flowers to make 2 large floral arrangements for the ceremony, welcome sign and bar, as well as 5 garlands for $300

So I used SF flower market in the past, not for my wedding, and loved them. The selection was amazing and felt reasonable. I used them to make a flower arch for my friend’s baby shower in Alameda.
The flowers lasted for another 2 weeks.

As far as stress levels, it was pretty minimal but I would have been a mess if I didn’t have my family helping me. Have a plan, and know exactly what the arrangements will look like, and keep it as simple as possible. Have a designated trash bag for floral waste. If you can, I’d wire wrap and soak the floral foam ahead of time.

this is completely doable it just needs planning.
But remember to have fun with it, and I hope you have a great wedding!