So I've sold my first wall job............its on a steep hillside on a lake to support a driveway (guy has a nice old 57' Chevy and a new Corvette). All together about 120' long and as high as 15' in some places wrapping around into the hillside. I've never built anything this big.........just small dry stack landscape walls..........this is a block wall. I read a lot on the internet and in books of how to do it so I feel confident and plus I'll get to play with a backhoe to dig out. I've never used on of those either but I grew up rid'n motorcylces and 4-wheelers and been around lots of mowers and so on so it can't be much more complicated. I figured about a week for me and a couple guys to do the job. I do have one question........some places I read about geograde and wondered if you thought it was really needed or not? Also any tips would be great.........thanks!!