I recently did a 4 day taper using bupe and it was pretty painless. I went with 4mg the first day, then 2 - 1.5 - 0.5. What I consider 'pretty painless' might be pretty uncomfortable to others, but considering my habit and duration of use I've gotten pretty used to being in moderate withdrawals for a few hours out of a few days each week, so any kick in which I'm not sweating a bunch, don't have horrible RLS, don't have horrible anxiety, and can actually get a good 4 hours of sleep is 'pretty painless' in my book. It's when my legs are kicking like mad, and my anxiety is so bad from the insomnia which prevents me from getting any sleep at all that I consider it a pretty bad kick.
To prepare for the taper I started spacing out my dosing more, then just did 2 bags of dope on the last day before waiting 24 hours to start the bupe, starting off with 2mg in the morning, 1mg at noon, then 1 more mg at night to ensure that I would sleep. The next day I was pretty surprised at how well the 2mg worked for me, particularly with the mental aspect (my body was still very achy through, but no RLS.)
Other times it's not this easy, so don't let there be a next time. Easier kicks like this make some people justify going back to using thinking that they can quit just as easily again, and that's not always the case. I usually find that the way I react to the first dose of suboxone is a good indicator of how the kick is going to go, and sometimes I still feel like shit after dosing even 6mg of bupe, whereas other times I'm way better from half that dose, and that's with quitting the same habit so you never really know.
I prefer the rapid tapers with bupe over the longer ones, unless of course you have a bundle + a day habit, then 10 days is better, but never more than 2 weeks on it. You just want to give the bupe enough time to build up in you a bit (while the short acting opiate leaves your system) so that it can do it's job by slowly leaving you due to it's shirt half-life.