With the way Infinity Evolved is designed, you will have to work on several mods simultaneously in order to gain access to higher tiers of Tech and Magic. Some plow through the tech side, and come back for the magic once the trees merge again in late game (Draconic Evolution, mainly). Others plow through the magic without delving into the tech. I would suggest working on them side by side, personally, as a few projects on each side require a time sink of some kind (waiting on waste from the IC2 reactor, for instance). This way, you always have something moving forward, while allowing yourself access to magitech cross mod help.
Since the pace of progression is slowed down, use the time to build pretty. Since the modpack should force you to consider new solutions, build imaginative. And for the love of God, speak clearly.
Best of luck.