Hi all, new to the site and trying (yet again) to start (and keep) learning guitar.

At the moment I´m following Lisa´s course for noobs :)

The problem I have is when I practice something like the spider exercise, I find that specially when you get to the part that you take your fingers away and get back to playing the open string (whether it´s the next string going forward or the same sting when you do it in reverse) it seems the pressure from mu right arm and elbow while at the same time nothing is holding the guitar neck, is causing the neck to sway away from me....

What am I doing wrong?