I look back at some of my very early projects (and even later ones with which I've had difficulty) and have developed a motto:
* do the best you can with your skill level today
* learn something from your work
* let your next one show your improved skill
and
* it's not a mistake, it's an opportunity for a design change
And I have a poster in my shop to remind me:
Skill is made, not born in us, and it advances best through difficulty. -- Charles Hayworth.