Notes on the PITA factor, important for anyone wanting to attempt this:
If you're a mechanically-inclined person, the type who can fix things yourself, take things apart and put them back together, then you'll have no trouble.
You'll know if this is you or not 
I didn't find it hard at all. I don't know if it's because I'm just very awesome, or very careful. I did take lots of pictures to refer back, and the first time I put it back together I had to double-check my photos. I do fit the description above as a mechanically-inclined person.
I did not have to use a zip tie or tie of any sort to get it together.
Bending a small hook in the hammer spring is a must for ease of putting it back together.
Re-assembly step-by-step:
1) place the hammer spring onto the hammer
2) place the trigger spring on the trigger assembly
3) lay the stock down in front of you in the same orientation as when you took it apart
4) make sure the hammer post is in place on the stock
5) take the hammer, orient it properly in your hand, and "compress" the side of the spring that goes down by rotating it in the same direction as the wind. All in your hand.
6) slide the hammer and spring down onto the hammer pivot post.
7) hook the compressed side of the spring (the down side) up over the plastic nub (with the hole in it, where the front trigger post goes). This will hold the downside of the spring into place.
8) you should be able to let go. The hammer will be in it's extended position.
9) Make sure the safety post is in place and oriented in the right direction as when you noted when you took this apart.
10) take the trigger assembly and trigger spring in your hand and orient properly.
11) Place the trigger assembly down into the stock, making sure the front post goes into the front hole and the rear portion and flat part of spring goes under the safety. Push it down all the way.
12) Important: move the safety to "fire" position. The notches will hold it here against the trigger spring.
13) Take the upper side of the hammer spring, wind it around once to bring in the tension, and hook the end over the post on the trigger. It should stay there if you put the little hooked bend in it. Now all parts are in their proper places.
14) Take the other side of the stock and orient it properly. Line up everything as best you can and press down. Here's where it gets tricky: it won't just slide all the way onto the gun. press it as far as it will go.
15) Pick up the stock (it should stay together) and look down into the gap above the hammer/trigger area. See the hammer pivot post doesn't line directly up with the corresponding hole in the stock due to spring tension?
16) Take a small flat-blade screwdriver and apply pressure to one side of this post to line it up with the hole while squeezing the two sides of the stock together at this point. It should go into the hole, but the stock will not go together just yet.
17) Look down into the gap again - now you see the same problem with the front post of the trigger assembly. This one is usually way out of whack.
18) Take your small screwdriver again and push this post into place, being careful not to let the hammer spring slide off the post. You will probably have to manipulate the plastic trigger itself to get the whole thing to move into place.
19) With that in place, cock the hammer. Now the two halves should completely, or almost completely slide together.
20) You may have to manipulate the coils of the hammer spring to get it all the way together. They sometimes get in the way.
