With hard work comes promotions to leadership positions. With promotions to leadership positions comes new responsibilities and maybe some anxiety.
This is normal! You can set yourself up for success in your new positions by talking to a few experienced managers. Start getting involved in networking sites and online forums for people in your position. The internet has made networking incredibly easy and should be utilized. Or, if you are interested in networking face-to-face, attend events for your field and bring lots of business cards.
Once you've made some connections, invite them to coffee or lunch and ask for advice. Ask them about the challenges and rewards of the job, the mistakes they have made, and how they handled tough situations. Most people want to help. They just need the opportunity to give advice and they will.
Leadership can seem difficult, but you don't have to do it alone!