I was wondering...i have been practicing this piece (Andantino #4 - see tab http://www.guitartabsexplorer.com/carul ... no-tab.php) for a few days, and, although i know the piece by heart, note by note and i do not have too much trouble playing compositions like Bach's Bouret("Comin' Bach" as played by Ingwie Malmsteen), i...really am going thru a frustrating experience on this one

First because i always get to pluck the wrong string somewhere somehow, and second, because practicing this piece over and over makes me unable to play my usual repertoire as efficiently as i was still used to few days ago, and i'm talking about pieces i have been playing for years without too much trouble....Ultimately it seems that i got new hands or that i need to learn my old riffs again, just like the feeling you get when you're walking after roller-blading for 6 hours in a row

So...is it safe to assume that i'm going thru all this trouble because this Andantino piece was written about 200 years ago and for guitars with different specifications, space bettween the string, etc...?
Did anyone ever come across the same feeling trying to play classical pieces on an electric guitar?