I read the above comment in an email last week following a days racing. How often have you heard that that. The start is 80% of the race and you must focus on starting technique if you are to become a consistently good at starting races. Statistically when there is line bias 3 out of every 10 boats will get a good start. If you watch a race on video, freeze frame 30 seconds after the start and try and pick out the leaders and note how many have fallen in their wake. You can have the fastest start in the world but if you can't start you are always playing catch up.
The first golden rule is to be able to see your boat clearly on the start line and where it is in relation to the line.
If you want to know what to do on the start look HERE
If you want things to practice, look HERE
If you want videos of starts look HERE