You only have self-leveling if you have factory xenon headlights. If you have factory xenon lights, and they're not doing the level test when you turn the ignition on, then the problem is most likely one or both of the level senders attached to the suspension.
Regarding baking the headlights, 200*F for 12min is all you need to soften the sealant and separate the headlights. DO NOT ADD SILICONE when reassembling the lights. You will never open the headlights again if you do. Silicone doesn't soften when heated. Just line the parts back up again and reheat, and press together. This is all the sealing you need. I did this on my car and it's not that hard, pretty easy actually. I would recommend getting decent AE's though, none of that khoalty crap, a lesson I learned the hard way. If you have any fear of tossing the lights in the oven, worry not, 200*F isn't hot enough to boil water let alone melt plastic.