Alexander take it from me... also a rank beginner... that barre chords are possible. When I first started I had BGU and attempted the first lesson - barre chords. I spent about 15 mins a couple of times every day, just trying to get my fingers somewhere close to where they should be. It still sounded awful and everytime I looked at my fretting hand it looked like someone elses
Quite frustrating.
I eventually settled just on the G7 and practised it in isolation,thinking I would crack it one chord at a time. And I did.....sorta :
I had to practise the G7 every day to make sure my fingers didnt forget where they were supposed to be. I ignored the D7 & A7 barres.
Then BBG arrived on the scene and I put BGU back in the cupboard. I have now been on the barre chord lessons in BBG for a few weeks and gradually the 6th string chords have got better,play cleaner/smoother and I can change chords quicker.
The 5th string barres are proving more difficult - and in fact I have just looked at Griffs lesson again to double check his finger positions again. I think more tweaking is required - but they are better than they were last week.
Anyhoo...two days ago I picked up BGU and started lesson 1 again. I played the G7, A7 & D7 barres without too much grief. I know they could sound better etc ....but I played them - which I couldnt when I first had BGU.
So BBG will set you up fine for BGU.
Just as Mandy said....barre chords do come...just a bit of practise and time.
Cheers
Steve