gerald,
I was lucky enough to shoot a fallow on my very first out when I first started stalking...I was put in a highseat and the chap said a group of fallow will come out of that hole in the hedge over there at just on last light...The tail end of the group will be prickets, shoot the last one...I sat in the seat, and everything happpen as he predicted and I shot the last pricket...
I remember thinking that stalking was easier than people said...I then started stalking roe in Sitka spruce forestry blocks up on the Borders near Harwick. Out on my own, and going up for probably one long weekend a month, it took me 12 months or so to get my first beast. Like yourself I was seeing Roe and getting "half chances" but it took ages for everything to fall into place and a beast to end up on the grass...
The thing that moved me onto the next stage as a stalker was realizing you have to be able to make those half chances count..I'm not saying you compromise safety, but rather you can't faff about when a beast presents itself safely, nor in the real world will you always get a prefect broadside target as many books imply...
Good luck on your next outing, but be warned, Roe stalking can become very addictive very quickly!
Regards,
Peter