1) Criticism of work is not criticism of self. So try to never take it personally.
2) When you’re offered criticism, consider how well-qualified the person making the offer is to criticise your work, and adjust your response accordingly.
3) While you’re not obliged to make any changes to your unpublished work as a result of any criticism it might receive, you’d be wise to consider doing so—especially if several readers have made the same suggestions.
4) Remember that your levels of reading comprehension drop dramatically when reading a criticism of your own work: you filter out the good stuff and magnify the bad, so that you translate “this is good but you need to work a little on your characterisation” into “I hate all your characters!”
5) Once your book is published, remember that people are entitled to their opinions and the only professional response to a review is to say thank you.
Right. Does anyone have any other points they would like to add to the list?