What sort of roof do you have? Depending on that, the bathroom and kitchen vents may be quite easy. I did a kitchen vent with my dad in a few hours with pretty minimal skill requirements (disclaimer - Dad's pretty awesome with DIY, but I can tell when it's a difficult job and this one wasn't really). I know you said you don't feel skilled enough to do it, but both of these are ones I would ask a handy friend to help with on the offer of a carton (the defacto currency for mates helping out in our culture, not sure if it is the same for you).
On the basement issue, can't help with that one sorry.