Routine is key, dinner, PJs, teeth, up to bed and story or two then sleep, or just chat with them about inane stuff until they decide sleep is a better option than your voice! We'd tend to stay with ours until they'd dropped off at first, then when they knew the score say goodnight after the story and go. Worked for us, hope it does for you.
Also give them opportunity to burn off the excess energy, an hour in the garden or park where you can (usually easier on weekends!). Find telly or a film can be like a tranquelizer at times for kids which sounds great, but almost always have issues come bedtime if we let that happen.
Last weekend my missus was out and I had them both to contend with. Spent the afternoon outside intentionally and had one drop off before seven before we even made it upstairs, and the other by eight after doing her homework, and they had over eleven hours sleep each. It will get better and you'll feel like a hero when it does happen!