I have the Lardy TRT series and SmartWorks. I like both. Over the years, I've kinda created my own system. I get through TT, Swim-By and Pattern Blinds with diversions then my five point drill - modified form of a "9 Point Drill" I learned from a pro, then No-No Drills, then some walking baseball to get more over when giving overs, and the wagon wheel lining drill for lining and push - pull at the line before I ever run the first true cold blind. Even then...the first blinds are not true cold blinds as I usually walk the pup out and "pepper" an area with bumpers and go back to the line and send. After that, three peats of the same blind concept where the first is a walk-out and the next two are cold.
I'm sure everyone has their own method, but blinds are all about confidence, team work, and change of direction when whistle stopped. Maybe I am overkilling IDK, but it works well for me and I like for the pup to be a confident blind runner before kicking pup off on his first real-world cold blind.