Overwhelm is solved with focussing upon the current step and the next only. The journey of a thousand steps can be easily foiled should the traveller attempt to climb stairs while staring at the thousandth step. A cool faceplant and only a semblance of the trouble that would occur should they do the same with larger tasks beyond the analogy. You have an end in sight, you have a destination in mind, and that has been chosen by beginning along the path of these steps to reach the summit. Good, the destination is picked and now it is to walk the path, to climb the steps and focus on one foot in front of the other. You’ll be there faster than you’d think and that comes from being present in the process of doing the work and getting stuck in the journey. The overwhelm comes from a lack of direction, a larger notion of the stack of work that is yet to be done, better to look for the next slip of paper, the next bit of work and get the stack done that way.
Meditate.