It's important to work with people, especially those that are opposed. Lots of people have trouble working at home. It's either hard to get started, or hard to stop. I've been doing it for 4 years, my wife for 14, both happen in cycles.

It's easier if you're in the office some days, but be prepared for workloads to suffer a bit as people adjust.

I might also recommend getting everyone together once a week, even if they have to "squeeze" into desks. If you have people on regular schedules, I'd also be sure you "regularly alter schedules so everyone gets time with everyone else. So if I shared desks with Bob and don't see him, we want to be sure that after a few weeks, Bob and I are both in the office and I might switch to sharing desks with John and miss him for a few weeks.