Please add yours to help others.
Mine are;
1. First step - Write your guest list, this will help you understand what size venue you need etc.
2. Sit down and make a spreadsheet. List everything you want in your wedding and all of the costs (even if its just a guesstimate for now). As soon as you have actual prices make sure you update it so your 'total' so it is always correct. Also have another page in the spreadsheet for 'payments' - things you have paid deposits for, when you have to pay the next instalment, etc.
3. Have appointments. I didn't have any appointments with photographers etc and now wish I did. Don't try to rush and book everything just so you can get things ticked off, make sure you have actual appointments and check through portfolios of their work rather than just looking online.
4. If it suits, speak to suppliers about paying upfront. Sometimes discounts can be offered. Be careful though, we paid our TOG upfront and have not heard from them as much as we did pre-booking and kind of feel like its because we have already given them our money.
5. Have a hair trial!!! I had mine and HATED my hair. If I hadn't had a trial, I would of just had my hair done like that on the day. It would have completely ruined how I looked and really not complimented my beautiful new dress!