Ciruits are usually LH for 25, or RH for 07.
Always approach from the north side (via red roof tops of Intel factory). Cross centre of runway (perpindicular to runway) at circuit height of 800ft QFE, and turn left on to downwind.
It's very easy!!!
For traffic comming from UK, you may have to come through dublin ATC airspace, or well north or south of Dublin. If things are quite, and you are comming in through Dublin you may be able to take a straight in approach.
Traffic comming from south will have to pass through Baldonnel restricted airspace, but often not active, and controllers are very friendly, and well used to light aircraft.
As always, if you are not sure what to do, then ring and ask before!!
As a lot of training happens at Weston, the circuit can get busy at the weekends.