I recall the first time I ever saw or heard of a slackline, I think it was you and your boy had one set up over a pool. Looks difficultWe used bamboo...4x4 support blocks with a "V" cut to prevent roll.
I bet you spend 4 hours at it you coukd walk from one side to the other. 8 days everyday 1/2 hour at a time. Gauranteed. Use a ratchet strap to get started. The shakyness seems impossible at first but you'll get it.Nah those aren't difficult, they're impossible