I would love to see you upload a video of you doing this, my dear girl. I’ll tell you this much. When I first learned barre chords I told myself “I’d rather suck and never progress than learn this. It hurts. It’s hard. And my fingers feel like they’re dying.” Sliding with barre chords is very difficult as a beginner. I easily remember doing it. Are you practicing along with a song or just practicing alone? You know, I embarrassed myself at my first gig doing punk rock stuff because my fingers wouldn’t slide right and my barres suuuuuuucked. But oh well!
I’m not sure what part you’re having trouble with. Does your wrist start to hurt? Do you not know how to play it properly? Is it hard to hold the chord and get a sound to ring out?
The F barre chord on the first fret is a pain in the ass to play for any beginner or anyone with small fingers. I find that the dip of my index finger knuckle just so happens to perfectly lay over the G string on barre chords: Which means because of my finger length, there’s no fatty flesh that I can just easily push on to the string with but rather a “gap” effect which makes me have to press down harder or my G string doesn’t ring out well. I also have to adjust my index finger slightly so this doesn’t happen.
my classical guitar teacher taught me a tip about barre chords and it helped so much. Maybe it’ll help you!
Tip: When you “grab” your chord position, let your arm kind of “hang” with the hand being anchored. The gravity pull from your arm will slightly add more pressure to the chord naturally without bending the chord out of tune.
For transitioning: I’d practicing going from a Dmaj barre to an Amaj barre just to get the feel of what the fingers are suppose to do when the chord changes. Then after that it’ll be a lot easier to get the slide and position change down