I always found that by letting go of the yoke, it helped me taxi. Initially I was trying to steer like a car
then a split second later I would realise what I had done when we were not turning, and get on the pedals. Eventually I just gave up holding the yoke when taxiing (unless in strong wind or on grass) and was fine after that.
I also use the odd bit of differential braking here and there to help me when taxiing too - normally in tight spaces and when doing 180 turns etc.
You will get the hang of it eventually.
BTW, what are the instructors like at Stapleford. I just signed up with them to hour build, but got to do my check flight. I was ill last week so couldn't do it. Hoping to do it on Thursday if I'm 100% again.