The most important tasks are usually the most difficult.
By committing to doing the hard work first you give yourself an advantage. Rigorous activity is the catalyst for impactful growth. Challenging and worthwhile work can yield an exponential return on your investment of time.
Conveniently, when you do the hard work first the easy work completes itself along the way.
If you desire additional encouragement, writer Stephen Pressfield has crafted the following books to help: The Art of War, Turning Pro, & Do The Work. If you have not read them then you are not informed.