Taking off flat based made sure that I got a good pop off the lip. Getting that little bit of extra pop made it easier to grab my board and then poke it out. It's all about being comfortable because a method grab is probably the most tweaked grab you can do.
Pat Moore does a good job of explaining it here too:
How To Method With Pat Moore - TransWorld SNOWboarding - YouTube
Also as with any straight air it gets you into the air with good balance so you can pull it off without landing on your head. I've seen tons of guys try and pop into the method too early and off an edge and they just sketch out and go crooked in the air waving their arms trying to get back to level. You need to pop, then do the maneuver, then bring it back to centre for a landing. This is true for nose grabs and big shifties as well which I'm good at, but as mentioned above, not so good at methods...