Here’s a good way to overcome the resistance and execute on the big ideas that terrify you: tell others about your grandiose plans.
You can decide how “public” you want your “public” announcements to be – if you want to go big, you can tell thousands of your loyal readers; or you can just talk to the people you’d dream of collaborating with, your colleagues, your spouse, maybe your boss.
Saying it over and over again has two effects: it makes the big idea more real to you; and you can replace your fear of getting started with how silly you’ll feel having talked about something to people you care about and having not followed through.
(The catch, of course, is that then you have to execute, otherwise you’re just a big talker. But I know – and you know – that you can execute. What’s holding you back is the fear of starting.)