This is a long route to get ther but helps to inprove overall first finger strength...
start by playing all six strings open with a full down stroke strum.
then "barre" the first fret with just your first finger making sure that each sting/note you pluck in you downward stoke is as clear as the open strings...
once acheived then move your first finger to the second fret and "repeat"...
do this up until you hit the 12th fret, then start over at the beginning but only hhitting the 6th and 5th strings....
repeat up to the 12th fret
then begin again this time FOCUSING on the 4th and 3rd string..
shake repat...etc
then last two strings of 2nd and 1st..
again, shake and repeat
do this every day for a week and you should be able to use a first finger barre with no problem.
good luck
J
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