Doubt & choice

Hi everyone,

If I have to choose between to choices and I am not sure about it, can I use the word "doubt" in a sentence like this one:

1) When I clear up my doubts about what to do...
or
2) In a few days I'll dispel my doubts about what to do...
(does "dispel" sound very formal?)

Are there words/ways to say it most natural for native instead of these ones?

Thank you!

Have a good day.

Alfonsinho