When I train I think of it as pain now vs. pain later. I can run up hills in the pouring rain in January to get fit for alpine climbing in May or I can skip it and just suffer more more when the time comes. Me, I try and train as much as I can as early as I can. Why? Because I can either suffer on some damp hill twenty minutes from the comfort of my local latte stand or I can put if off and suffer more on some big scary mountain in a few months.
Similarly developers don’t seem to like estimating work. Planning poker or wide band delphi sessions take time and most people consider them boring. But it’s the same game, pain now or pain later. If you don’t put in the time now then later you’ll probably be working late and weekends playing catch up when your guesses – because you skipped doing real estimates – don’t pan out.