Well, if you're practical you should be able to manage it. I did it and I'm not remotely practical! (To be fair, there were instructions, but they appeared to be translated from the Icelandic!)
But don't try to do it on your own. (You need several of you to actually erect it, for a start.) And have a good look at standing greenhouses first, to see how they're put together. And make a note of how you dismantle it. (Number all the parts if necessary and do a few quick sketches: I've only done one greenhouse, but I've had a lot of experience of erecting & dismantling stage scenery, which is fairly similar!) And get a good solid base down so that you can fix it well.
Could be fun - but even if it isn't you won't regret having a greenhouse.