Hi Kolya,
to the IIS forum.
I can say that my Bintel 10" Dob (and the other sizes, presumably) came with instructions - although some were a little vague. However, they are very easy to assemble - just take it slowly.
As has already been stated by the others, a 10" Dob is starting to get large and bulky. You can add locking casters to the base if you are using and storing on the same level.
I also have an 8", but it is mounted on an HEQ5 mount. The 8" Dob would be a very good scope to start with. It has about 40% less light-gathering power than the 10", but so much easier to move around and transport. It will still allow you to see most objects a 10" will see, but a little fainter. At a dark sky site you would not be disappointed!
Cheers
John