Getting started creates momentum.
If you've driven a stick shift in your life, suffered a dead battery, and tried to push start, you understand the importance of getting started. You might need 3 people to get the damn thing moving, but once it is you might be able to push it long enough to start with just 1 person.
Same for anything else difficult.
If you think it difficult, it is, and so get started. You'll either prove yourself wrong or understand just how difficult. Either way, you will have made progress. Progress to either finishing it or giving up on it.
Go, get started.