The 1-12 adepts can be duo'd by decently geared lowbies if you have a tank and a healer, not super twinked out, but ones who've put some effort into their gear. Even poorly geared, you should be able to bring down with 3 people. Starting at Angar (14) it starts being rather beneficial to bring at least a full group and will be a lot easier if you partially fill a second group too.
If you scout out that the mob is up and advertise in /gu and /ooc with the adept mob name and max level for engage, you usually won't have to spend more than 20-30 mins to get enough people for the low level ones.
Don't be super stingy with the level ranges either. Don't advertise looking for people 10-12 for Adept Mist Stalker, bring 7-12th level people. Utility and heals, in particular, you can get away with a lot lower level than you can on the tank and dps. Make some friends while you're out there and don't forget to be fair with loot. If you're organizing it you'll be somewhat expected to handle loot distribution.
As for yourself, depending on what class you are it will be a lot easier if you're 0 to 2 levels below the max engage rather than far below. Again from the perspective of if you're organizing it, people may have higher expectations from you. A level 7 organizing a level 12 adept raid may find more difficulty in getting folks to go than a level 12 will. That being said, it doesn't hurt to check. I've personally got a fair number of lowbies for messing around on, and always join adept groups with what I've got in range, regardless of whether I'm interested in anything from them.
