From Raikot bridge to tattu it is a jeep ride I think it is doable by bikes too.
From tattu village onwards it is a trek on feet, I also saw some donkeys with luggage. But I dont think bikes can go from tattu to fairy meadows.
I went on a university trip so dont know about cost of huts or contact of guides etc. As far as luggage is concerned I went on a ~10 day trip from lahore to fairy meadows to karimabad and back lahore. Waterproof trousers and jacket is a must. Good shoes preferably water proof too and with strong soles. Also clean drinking water was difficult to get on the journey there was only clouded water A lot of money was spent on water bottles. Rest others can guide better.