One strategy that sometimes works for me (ADHD) is the "momentum building" approach.
Rather than start with the hardest tasks first, I'll start with the easiest.
If I'm struggling with the easiest one, then it means I need even easier ones on the list to ramp up.
If I'm REALLY stuck, I can often overcome that starting inertia by doing something physical IMMEDIATELY (pushups, body weight squats) and then trying to see how fast I can start the task I'm stuck on. Something about getting the body moving seems to help.
There is also the trick of doing some introspection about why I'm having trouble starting a task, because often my executive dysfunction is tied to some emotional valence (eg fear of messing up, fear of taking too long because I will get distracted) and addressing each one aloud ("It's okay if I mess it up, I'm going to try it anyway", etc).