hi guys am i missing any pointers ,i got 2 tonne of sharp and 20 bags of cement and a mixer to lay 5.4mx2.3x 75mm thick screed tommorrow ive got the dpm down 50 mm of celotex and batterned around the walls to help me ,i was going to go down the edges and the front wall level off and startworking backwards ,in the mixer would i be better sticking to 3-1 or 6-2 and anything else to look out for guys