Make sure you are testing everything as you go. A website is comparable to just about any business. If you set up a new organisation it is impossible to establish an organisation that runs perfectly from day one. Good organisations become great only through consistent ongoing improvements. A website is no different. It is impossible to get a website perfect from day one (no matter how good you are). A fantastic website only becomes so through careful TMT!
Test the different items that you are using to establish your trust and credibility. Test your headlines. Test your website content and test your calls to action (even test your prices if you are selling online).