Lee,
2 points.
Firstly, Greg has an excellent drill for shifting weight during the swing. Its called the walking drill which you will find on this site. Well worth practising and is effective.
Second. Weight shift should occur naturally as you move your body weight to the right in the backswing ( if your right handed). If it doesnt you may be straightening your right leg forcing weight to the left creating a reverse pivot.
I would recommend that in addition to the walking drill, practise regularly two things. a. Pivot drill. b. Turning or coiling on backswing while focusing on keeping flex in your right knee all way to the top. Then you will definetly feel both weight shift and coil.

Hope this helps
Jimw ( Aus)