Where do you get the experience from? By being prepared to take any work coming along, as most first instructing jobs will be part time (though not always). By having another job to fall back on when the going gets really rough. By knowing everyone and getting on with everyone, which might give you an edge over all the other pilots - after all, you can all fly, so why should they choose you? By being lucky...perhaps the most important thing.
And if you think it just isn't worth it, well, you're probably right, and if you've read this forum at all, you'll have realised that many on here would agree. It's a tough old world out there, and the rotary flying bit of it is one of the toughest.