Harry you have the right idea mate - better to respect the limits and live to kite another day uninjured....as many will attest, you don't progress at all while watching the wind blow the trees from your sick bed.
Persistence is the key, this game is 90% dogged persistence and 10% skill.....just keep plugging away, session after session.....suddenly it all comes together, you'll ride away upwind, kite for hours without falling, come back with a large grin on the dial....then be hooked on checking the wind forecast 5x a day like the rest of us.....

good luck, good winds, Andy