With 15 years of catering experience and one wedding under my belt, I think I can offer some advice

The biggest problem I had as a caterer was the wedding that spent all of their money on 'glitz' and came to me wanting 'steak' on a 'beans and franks' budget.
My biggest wedding suggestion is to decide how many people you want to invite (invite everyone you know!) and decide from there what kind of wedding you can afford.
There's nothing worse than trying to decide who you will invite and who you leave behind. Simple food, done well, is better than lobster without your friends 
Let me know what else I can help with!
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