I use the mishit style and my putting is pretty good from within 20ft though not phenomenal.
Basically it is all about getting used to it (i.e. practice).
After a while, you can just look at the break and you know how much to mishit almost instantly.
With longer putts with a lot of break, I use both the aim and mishit, as I am more comfortable with a mishit range between about one inch either side of the ding.
If I think it has more break than that would allow, I aim first for the bit extra that I think it will break, then mishit it the remainder.
The most important thing do is to get the pace right. You want to hit it the distance shown plus about 1 foot.
Also look at the putt from in front and behind the hole, as sometimes you can get a cleare picture of the break from behind the hole.
The last thing which thankfully I havent done for a long time, is don't incorporate break into your calculation that is past the hole (stop laughing at the back). This is where the looking at both views of the putt comes in.
Driving's for show, putting is for dough (or credits as the case may be)