One, to just enjoy the journey. Weather it's learning a new skill or just making a new pattern. Enjoy every step.
Two, read the pattern in its entirety. Several times if necessary.
Three, just finish (I have the UFO's to prove my lack of dedication.) or make the decision to either donate or toss. Because life is way to short to continue doing something you don't love.
Four, when in doubt, make a demo block. And, make them all in a cohesive colorway. That way, you will always have a cohesive quilt that you can finish with orphan blocks.