I recently found this helpful
I'm in a relatively new job (3 months) and that means coming to terms with a lot of things (jargon, organisational culture, aligning to corporate norms (and breaking some), getting to know new team members, some local and some remote) and in all this, as usual, deliver valuable work.
I'm no newbie to this, I celebrate my half century next month, but for some reason this post worked for me. It helped me see (reminded me?) that everything, no matter how daunting, is mostly a series of small steps, and each of these mean relatively little on their own.
Maybe this perspective can apply to internal resistance. It did to me with my to do list each day. Every item is a small step on the way to the next one. Just complete the next step.
This is probably not completely aligned to your point but I am just a tad amazed that this seems to have worked for me at 50!