Don't do things just because it's tradition. Your wedding is YOURS. If you want to have a roller disco and a sushi picnic, go for it. People will love it!
When you calculate your budget, expect to add at least £2k on. And don't push yourself to your financial limit.
Don't buy a dress two sizes too small and then gain two stone, like me
By all means DIY things, but get it done months in advance or you'll be way too stressed to enjoy anything.
Don't worry about people enjoying your day. A wedding isn't the same as a standard party, the whole atmosphere is different. It will be amazing!
If you're really in to dancing and discos then go for it, but if you're not and your guests aren't then maybe consider an alternative after the first dance, cos they can be so awkward!
Decide on the few things that are important to you and focus on them. For example for us it was making it truly personal, the venue, and the dress. Traditional bits like the cake and flowers weren't too important so I left those til last, and we might not even have a cake!
Consider alternatives to the norm. It can save money and actually make the day even better.