Hi,
7 months is still pretty young to be sleeping through, although I am sure that you will be feeling like many people you know do have babies that sleep through the night.
My 2, didnt really sleep through until they were almost 12 months old. When I started training them, then initially I started getting them used to going to sleep on their own, without aids (patting, pacifiers etc) for the 7.30pm sleep. I would use controlled crying. For my son I would go in every 5, 10, 15 minutes (it never want passed 30 minutes in total), for my daughter I would go in every 2, 3, 4, 5 etc minutes (she would get herself really worked up otherwise). I would simply go in, and say hush, night night time, hush (gently)After a few nights they were happy to go to sleep on their own.
Then I said I would not feed them until after a set time. Say 1am. Then following the same controlled crying process, I would help them go back to sleep. After afew nights they would sleep through until about 4am, sometimes 5am. For this wake up time, I never had the heart to let them cry, so would generally feed them, and hope they would go back to sleep. If it was 5am, then generally they wouldnt.
You have to do what you most feel comfortable with. I also found I had to adjust my technique to the different personality of my second child. The most important thing was they had to learn to fall asleep by themself and without any aids. Good luck.