diy Hairdo Help

We eloped on our original date last year because of Covid and are having our wedding celebration this year. The salon I was using kind of screwed me over so I don't want to use them again. I am considering doing my own hair for my wedding but have a really difficult time getting things to stay and designing in the back of my head where I cannot see.

I have long (armpit to nipple length) blond fine hair that is naturally wavy. I have a lot of hair but its very fine and doesn't have a ton of bulk or volume. The overall aesthetic I want is a do that has movement and is soft and romantic, I like waves and texture and do not want anything super sleek or modern. I was thinking a low side bun with some loose face framing pieces. I have found some tutorials on YouTube but haven't had much luck getting them to stay - they look okay but fall out of my head after a few hours.

I think I need some sort of texturing product and something to help hold my hair in place, but I don't want products that will weigh down my hair or make it stiff and brittle.

Any tips, tricks, links to easy to do hair styles, or products you love? Also any tutorials about installing hair combs, hair vines, or other decorative hair pieces? I have less than 2 months to experiment and figure this out!