The next step is to examine the impact of being incorrect in each direction. If we overestimated the rate of portfolio growth, then we should have converted up to a lower level and the impact on QOL is possibly significant (because our investments have done poorly and we gave money away that is now needed). If we underestimated the rate of growth, there are no dire consequence (because our portfolio is fat) and, while we pay more taxes than optimum (in retrospect), we're still money ahead vs our planning.
So, I'll be very conservative with these conversions.
+1
This. And Aeowyn's annual reevaluation strategy above makes sense as well (as opposed to relying blindly on i-orp's recommendations). If i-orp is an "educational tool" (much like FIDO is now), then yes I'll agree it can be educational (at most--again, like FIDO).