As with Aussie Andy my training airfield is also Wycombe. My first landing on a grass runway was actually when doing circuits at Wycombe when I was instructed to setup for an approach on 25L (grass) instead of 25R (hard). The main thing that shocked me was how much bumpier it is. Doing a take off it feels like the plane is going to fall apart. I think with grass strips you've just gotta be extra extra light on the nosewheel.