We've all been there, I heard that last monday (21st Jan) was officially classed as the most depressing day of the year, the day when more divorces happen, more suicides, more businesses fail, etc than any other day of the year.
Why...because of the dark days and darker nights, the cold and inclement weather.
None of it is is going to put a spring in your step!
By the sound of it you are looking towards doing door to door sales, to be honest I can't think of anything more depressing than that!!
Working on windows by yourself can be quite depressing, especially when the weathers bad. Take a young lad or lass on and get them to work with you, you'll be surprised how much faster the day goes and once they are up to speed you'll be earning more too.