What advice would you give to a new house flipper?

[Steve Pollack]

I've been in the industry for 30+ years and I've accumulated some valuable knowledge, but I'd like a fresh perspective from the Bigger Pockets community. 

If you could give one piece of advice to a new house flipper, what would it be?

Thanks, 

[Susan K.]

What ever you think it is going to cost - add 20%.