Here we go -
1st - very ambitious to say the least - kudos.
2nd -
soap & warm water will work on most of the stuff that comes out of
FW. I also use an old electric toothbrush to help the cleaning process.
HOWEVER - check the pieces once dry. If there is any shiny bits left you may have to get rough. if its surface, not deep detail, then a knife, file &/or wet'n'dry paper should do the trick. If deep then a brass wire brush. There are also fibre glass pens that can also be fitted with brass brushes (
http://www.maplin.co.uk/Module.aspx?ModuleNo=3932&doy=12m4&C=SO&U=strat15) - note - ALWAYS wet the pen before use - otherwise you could get flecks of fibreglass in the eye which won't just ruin your day but could ruin your sight for life.
3rd -
a razor saw or clippers will work - it depends on the situation. don't try to remove too much at one go if using clippers - nibble the resin away - otherwise the piece could partially shatter & remove part of the model.
4th-
superglue is the only thing I would use. On a really big model with spindley legs then pinning may be necessary.
If the joins are flat & clean the super glue will set almost immediately so dry fit everything. You don't get the chance to move bits around like you do on plastic models - mores the pity as fitting some
FW parts can be a real pig.
5th -
10:1 the model will need filling. I use green stuff & have a whole range of dental tools & clay shapers to make the best job of it. These should last me (the dental tools) forever so I don't really see it as an 'expense'.
Remember you have just spent a lot of money - spend a bit more to get the right tools to justify the outlay & so you don't get disenchanted or disappointed with it because you didn't put 100% in to preparing & putting it together right at the start.
6th -
good luck!