I think most the most important thing would be to have a good bore guide like a Mule Lucas bore guide and use a nylon coated one piece rod like a Dewey rod to prevent any damage to the barrel.
I've seen guys scrubbing at the range and they say they are doing a breakin. Without the proper tools, you'll do more damage to a good barrel with bad cleaning techniques. Especially when they are going harder than they would on a hooker on a Saturday night.
My gun builder told me just to shoot mine. It's a bartlein barrel and never followed a breakin method of any kind. I'm 1300+ rounds in and it still shoots Great!