No special access issues
Cwm Glas Bach is a sprawling mass of isolated boulders, strewn out across the hillside at the South End of the Llanberis Pass. As such, directions to each individual area would require a separate website on it's own.
In general, park at the large layby at the south end of the pass, walk back to the bridge by the farm, before doubling back through the gate and heading towards the Climber's Club hut along the obvious path. From here, spur off for your chosen area as and when you get close enough.