Its possible to learn without assistance... its just more likely for you to break a lot of airplanes while learning. (and then there's the stuff you could hit with the airplanes: car, house, cat... kids.)

I'm not familiar with the Kombat 40 trainer. The reports I've herd... its heavy. Heavy trainers make it harder to learn, because the plane has to fly faster. It gets to where its just a tiny speck REALLY fast when going with the wind. (very hard to fly that speck back to you...)

Also... an untrimmed plane with an inexperinced pilot means you don't know for sure if the plane needs adjustment or you're doing something wrong.

I've helped one person recently that really just needed the airplane trimmed, then 3 SHORT lessons and he soloed... This was after he'd destroyed 2 aircraft (one he split the cyl off the crankcase) trying to teach himself with un-trimmed aircaft. (under 30 sec each flight... those were a couple of EXPENSIVE flights!)

Even if you hav to drive 50 or 60 miles to get to a club flying site... it would be in your best interest to get at least one good session with an instructor. The plane will be trimmed, and you'll get some pointers on how to correct any bad haits you've started to develop.

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ALSO:There's a NEW design for a tainer made from coroplast... (just got posted.) It looks like the Sig LT-40. It Flys like the LT-40! It weighs almost the same as the LT-40. (In essence its a nearly indestructable LT-40...) Cheap, easy to build... Might be worth looking into.