You likely won't shift as often with bar-end shifters as with STI because the shifters aren't right there where your hands are, Apart from that, bar-end shifters are not hard to learn. The front derailleur shifter is friction (not indexed), you put the lever up for the big ring, in the middle for the middle ring, and down for the granny. If the derailleur needs a trim, you just nudge the shifter in the right direction. The rear derailleur shifter is indexed, though you can set it to friction (non-indexed) if you prefer. If you go with a top-normal rear derailleur, you lift the rear shifter to shift down and lower the sifter to shift up. If you go with low-normal, you lift to shift up and lower to shift down.