As Mark mentioned, there will be many people offering to be your trekking guide. Completely not necessary as the path is well travelled to say the least so as long as you have the standard trekking map sold everywhere in Kathmandu and you know the name of the next village.
What you should consider is whether you will want a porter to carry your stuff. If you are a hiker normally you will probably prefer to carry your own pack, if you are not then you may want to consider it. The air is mighty thin at that altitude and most people on your route will be carying their day packs while the heavy pack is being lugged along by a porter or by yak if it a high priced tour. They will charge you a lot more to organize a porter out of Kathmandu, you can usually get one in any village if you are feeling a bit altitude sick on any certain day, try to organize through the guest house you are staying at as otherwise there is the rare but still occurring misfortune of a porter sprinting off with your life belongings and all you know is his last name is sherpa.
Since your biking, I'm guessing you'll be lean on backpacks and gear so you may be pretty light anyways
You can rent a backpack and stuff in KTH and warm weather gear in Namche. It get's more touristed every year, but the trek is an absolute classic. Cheers.