Just time the gap inbetween them. As it gets closer and closer, you're heading towards the end of first stage. To avoid unecessary intervention, wait until they're almost on top of each other before going to hospital. The closer you are to pushing, the less likely to have "hospital policy" pushed on you.

I was induced for my first, and natural for my second. The second one built up a lot slower, instead of hitting me all at once. I much preferred a natural labour. Good luck!