So, two things. There should be at least two guys on planetvb.com that do the solder method, which will make the lens last for a very long time. I believe DogP did mine a few years ago. The other is the oven method. There is a few videos on it, the biggest thing is the heat setting, the foil on the pan and being able to look into the oven (clear window). When you see the curl on the "lens" ribbon start to lay flat, you know the solder has loosen up enough. Wait 5-10 seconds then take it out. It may be a little warm, but not too much. Then you want to wrap the solder area tight with tape to keep it together firmly while it cools. I've gone the oven trick for a few users on planetvb as well as ebay and only one user had an issue, but I think they pulled the damn ribbon apart lol.
Good luck either way you go. The oven trick took me about 1min 35 sec in the oven after preheating and another 5 seconds to wrap it up.