I once ran a 30-person team that did nothing but software implementations. Happily, software implementations haven’t been my bread and butter for some time. (It’s a lot of effort and stress). But I had a good track record in this area, and I have some proven ideas about how things should be done.
Most of it boils down to one key rule: One hour of entry on the system is worth 20 hours of talking in a conference room. (Although your mileage may vary.)