As many things in life is web design much about the details. Paying attention to all those small little things might take your website from ok to brilliant. When you rough out the first idea of a site/page you obviously won’t be able to make it a 100%. Half of the work will probably remain to be done. Start thinking critically and start looking at various different ways of fixing the design.
Even though you might be under pressure of getting the design done you shouldn’t rush this moment through. There might be some late nights but it will be well worth it. Start polishing the site’s design and when you start having trouble focusing it might be time for a short break. When you come back you’ll probably be able to watch at things in a new angle.
Experimenting a bit (it’s better to have tried something and rejected it than never have tested it out) might be a good idea but remember to still keep it consistent. If for example the pixels don’t match on a site you risk the chance of creating something very messy looking.
My last advice would be completing everything. If you intend to leave something semi-good you might as well not do anything at all. And whatever you do – don’t forget to take a look at the details!
Cheers!