I completely agree with Big Pistons on this. I had the great fortune to have been mentored through this challenging learning curve by a former Red Arrows team leader. Competent instruction, briefing, and practice is vital.
My experience certainly supports Anonystude's thoughts as well. My friend and I used to fly the Ercoupe and Tomahawk around for hours with one wingtip trialing the other's by 10 feet, and with practice, it was easier than being further away. This was done after LOTS of training, and progressively closer practice - and a lot of trust in the other pilot.