Stop waiting for the task to get easier. Waiting will only make it more difficult.
Go ahead and get it done. Then you can move on to something even better.
The effort may indeed be difficult and painful. So it's best to have that effort behind you rather than in front of you.
Imagine how great it will feel to have it done. Imagine being free of that little voice in the back of your mind that keeps nagging you about it.
You cannot avoid the pain of effort. You can either prolong that pain by procrastinating, or you can get it done and get it over with.
Start right now to get it done, and soon you'll have it finished. Get it done, and delight in the glorious feeling of freedom and accomplishment.