set a timer for yourself to do the thing you've been procrastinating for five minutes. then work up to 10, 15, etc.
i often feel way better after I Do The Thing. the procrastination part is usually just dreading getting started, but once you do the task tends to go by quickly, esp if you put on music or a TV show in the background. calling a friend or just having them in the room to body double is helpful as well if you are of the ADHD persuasion.
i totally understand the fear of failure though - i often let wanting things to be "perfect" get in the way of "good enough". not that you should half-ass things, but go a little easier on yourself. i'm sure whatever project you're working on will turn out 10X better than you think it will. best of luck xx