I started FTB back in January or so with the Mindcrack pack which had Gregtech. I had never played anything other than Vanilla before, so my first experience with FTB was with Gregtech. I didn't find it difficult to learn at all. I found it frustrating that there was a bunch of make this, but first make this to make this, then oh wait, you need to make this to make this to make this, etc, but that's not really limited to GT.
I say, try different packs and stick with the one you like, or alternatively, go to the wiki, find out what mods are in each pack, read up on the mods, and play the pack that has the most of the mods that interest you.
I say, try different packs and stick with the one you like, or alternatively, go to the wiki, find out what mods are in each pack, read up on the mods, and play the pack that has the most of the mods that interest you.