do NOT strip the outer sheath.. which from the sound of your description is what you did..
FIRST PUT THE BOOT ON THE CABLE!!! many have been caught out by this...
use the JH to score round the cable where you want the gland to be and make sure you cut more that half way through the armour strands...
then remove the upper part of the outer sheath.. and unwind the strands of armoured..
take one or two armour strands at a time ( NO MORE ) and bend at right angles to the cable and the back up..
if the strand has not broken off, use the JH to score it a little deeper and retry..
repeat for all strands..
THEN strip back the outer about 1-1½ inches depending on gland design..