Non Negotiable Time.
One of the things I wish I would have implemented sooner was setting non negotiable time blocks for myself. I wasted valuable days / hours / months / years of my life worrying instead of doing. Worrying about "if it was going to work out" or "if its not perfect the first time I've ruined my chance." By living in that mindset, I really did myself a huge disservice and likely missed quite a few opportunities because of it. I justified my thoughts by claiming I was prioritizing. The truth is I was scared of what could potentially go wrong instead of getting excited about everything that could go right. Once I figured out that the key to being successful was non negotiable time, everything changed.