Actually the basics are VERY easy to do. I am a total newb with this program, I just bought it, but I already got it to turn my ringer off at night and back on when I wake up during the week unless I have “off” posted on my calendar then it keeps it off so I can sleep in on my off days.
I also got it to notify me with a pop up to go to bed, I do that when I read at night the reader program is full screen so I don't see the clock.
That is why I said post in the forums there, they would walk you through it. The basics are not that bad... It is a very powerful program but you don't have to use all that power or for everything, I have only scratched the surface.
Lets try this since you have it installed. I have no way to be in a place with no signal to test so… You mentioned you only wanted it to go into Airplane mode when you lose network so this is easy.
Just looking at it real fast it looks like a simple new--state--mobile network, select the 2G, 3G etc... Hit invert because you want it to trigger when it is loses connection, then add what to do.
Hit the plus to add then hit net then Airplane mode and set to on.
That should put it into Airplane mode on the loss of 3G.
Looks like that is all it needs. I am not 100% sure if that is it as I am still learning more about it but you can post that and let them correct it in the forums if need be. They seem very helpful over there so far.
All you have to do is get that one thing working and it pays for itself. Once that is set up you don’t have to touch it or use it again. Just let it run.
Anyway I am just trying to help man.. I have nothing to do with Tasker except I liked it..
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Edit: looks like you have to only select 3G or it keeps putting it into Airplane mode since I don't have 2G.
I am unsure how to test it so I think it can do it but you should just ask over in the forums, I am sure it is easy.