Step 1- Remember, this is FOR YOU. I have seen entirely too many weddings for too many people get ridiculously out of control because someone not actually getting married that day tried to get in on the koolaid. They want xxx at your wedding, either they pay for it, or they berkeley off. Or maybe they just berkeley off if it's really stupid.
Step 2- LOCAL BUSINESS IS THE JAM. Cases in point- we cooked for our own wedding. I think we fed something like 250 people for around a buck each. We got all our supplies locally. I went to a butcher and bought turkey by the case off of him. We used side of the road garden shops for veggies and whatnot. And the dress. There's plenty of national chains that will fleece you for a dress. You know who won't? The little local dress shop. They like making deals. My wifes dress was originally like.....2 grand. My cost? (well, nothing her grandparents ended up gifting it to her, but I still count it in the total) 350$. How'd we do that? Local shop. They had a dress that was AMAZING. it was originally a demo of some fashion like... 5 years before we found it. Since local shops can't really afford to LOSE stock, they just mothballed it in a corner. We dug it out, and we got it CHEAP. Rings too. My wife found some crazy assed little jeweler (Think jewelry row in NYC, but in MN) and we went there. He didn't have a storefront. I had to be buzzed in. If you ever see the CF/Tungsten Carbide ring that has the beveled edges, I own the prototype. He bought it directly from the manufacturer in...wherever. Sold it to me for 85$. My wife- strangely didn't want a diamond. She picked out a ruby/gold number. Lab created gem. 85$. My tux, E36 M3 I even got a deal on that. Typical rental, but I used my own shoes because I wanted a little flava with it. Got a deal because I didn't have to get someone elses foot fungus.
Venue- think about what you want. I'll be honest, receptions that take place in a hall are kiiiinda boring. Sure you can have a good time with the right crowd, but it's all the same chicken dance/electric slide with a DJ in a can. Boring. I got lucky and my inlaws own 40 acres. You can throw a big berkeleying party on 40 acres. We had our wedding on Halloween, just to add to the fun. We actually did most of the prep work ourselves, with my FIL throwing in on stuff like a two story bonfire, and other fun things. (Yes, it was as tall as the barn.) we were able to repurpose a lot of what was already there for things like tables, signs, and whatnot. Our cake was made by one of my wifes cousins- but I could have made it. We didn't have booze at the wedding (on our dime), because neither of us drank at the time and it would have been ludicrous to pay for someone elses buzz. We called it BYOB, and boy they didn't disappoint. My brother puked in the bushes outside the hotel after my FIL conned him into drinking some E36 M3ty blue vodka.
Ceremony itself? Meh, it's all legal paperwork to me. We did an in and out at the local constabulary/courthouse. MIL worked there in the ticket dept. We actually got $$$ from the ladies that worked there with her! It was rad. All in all, dress, tux, food, legal mumbo jumbo, the rings...1000$. After all the wedding cash was counted, we actually MADE a profit.
All in all, remember, it's for you. You're inviting other people to share it with you, but it's yours. No one else has the right to tell you what they want. It's like inviting someone over for beer, and them complaining you don't have what they drink. berkeley you drink water then in my motto. Seems to apply here as well.