I am simply horrible at estimating. I get paid to work on difficult (at least to me) problems; things I haven't done before. A typical project involves trying 9

I am simply horrible at estimating. I get paid to work on difficult (at least to me) problems; things I haven't done before. A typical project involves trying 9 things that don't work before I find the 10th that does. There is no way I can estimate that sort of thing. Thank goodness I'm pretty good at managing (i.e. reducing) expectations. When pressed for impossible-to-estimate estimate I fall back to giving a range: "2 weeks to 2 years"