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i did find a few of those threads but i was still having trouble with it and they were all from around 2008 so i decided not to revive them.
Are you interested in speed solving or fewest moves?
If you want to adapt it as a speed solving stratergy, http://s92824201.onlinehome.us/ is useful. Its not been updated in a long time, but a very informative site.
For use in fewest moves, it would be best to look at example solves. Practice different techniques. Edges first is not the best approach in all situations.
Don't use Heise. It's an advanced method useful for purposes other than speedsolving for the most part. You would be better off continuing with Petrus.
I have to agree with most of the opinions here; Heise is quite an advanced method, I'd argue it's better you just learn/understand commutators and conjugates (on Heise's site) than to try to learn his whole method as the edge permutation of the last layer (whilst insertion of the last F2L pair) is something I myself am still trying to learn (I average 25 seconds with CFOP and am very confident in my F2L intuition, still working on look-ahead though)
but if you do understand commutators and conjugates, you can in effect, solve the cube on your own via your own made up algorithms (and the same concept can be pretty easily used on other twisty puzzles as well)