also for alaska, pick up a copy of the 'alaska river guide' by karen jetmar.
i would also get the 'alaska fishing' by rene limeres and gunnar pederson. lots of river info in there too and the only AK fishing guidebook worth a damn too. get what beta where you can because it's generally hard to come by for most rivers.
i've done a couple DIY up above the arctic circle and in SW AK. if you need any contact info for pilots or rental in those areas then PM me. my river trips have been more fmulti-day fishing trips than ww but you still will be challenged. AK is very different in some ways... with braids, shallows,constantly changing river beds,weather,bears, remoteness,logistics,ect.
always ship your gear in advance to whoever your bush pilot is or contact up there is for the trip. it will otherwise get lost or delayed and you are fucked, thus fucking your group too. carry on or ship it USPS at least 1 month or more in advance.
also, you can ship rafts/gear up to allot of remote towns too via a combination of UPS,USPS and Alaska Air Cargo. AKAC is does require a Known Shipper ID though and is best to use it on the return leg through your bush flight co, outfitter,ect. they will have one. ship all 6 weeks in advance. this all said renting is easier,if the gear is good.
and always bring deet and a head net... just in case. it can be no big deal or insanity.