There is not really any setting up to do, it has got to be one of the most simple engines of all time, the hardest thing is proabably the valve timing which a two year old could do.
It is such a basic old design, std common sense is all you need, certainly no harder than other engines, unless you are talking some very fancy stuff used in very high power applications.
It doesn't always follow that you can blame someone else if they build it either, you may blame them but will they be bothered financially or otherwise ?
I have rebuilt engines trickier than cossie yb in a sitting room before on the floor and table, not ideal but do able, though a shed/garage is ideal.
tabetha