OK, so I know I am the odd one out here, but I try not to freak out about spiders. I do get a good laugh from watching my cats chase them to death, and it seems I saw fewer after we got the cats.
Hobo spiders are somewhat common in the area where I live (Salt Lake Valley), but there are also garden spiders that are mainly harmless. The only time any spider will bite a human is in self-defense. Yes, hobos are venomous. But usually not life-threatening (more so for babies and small children so be extra vigilant).
Hobos are ver mobile, making it hard to get rid of them with chemical treatments. In fact, sprays may make things worse by killing competing spider species and allowing them to flourish. The best thing is to make sure cracks in the foundation are sealed so they can't get in. Then keep the floor clean of 'stuff'. They like hiding under clothes, toys, boxes, etc. Bites are most common on the hand, from picking up or moving what they are hiding in so be careful in areas of the house where they hang out the most (for us it was the basement). Keep bedding from hanging down near the floor - they may climb up and hide in the bed, then bite if someone lays on them.
A hobo spider is usually painless at the time it bites, and many defensive bites are 'dry'. If there is envenomation (poison in the bite) there will be a large area of redness around the bite right away which fades after a few hours into what looks like a mosquito bite. Hobo poison kills tissue, rather than being a nuero-toxin like black widows, and usually is very mild. But if someone is bitten, take them to the Dr. If you can, capture the spider and take it in too, as that is the most sure way of identifying what kind of bite and determining treatment.
But like I said, spiders won't bite unless they feel threatened. And they help control other pests (I'd rather have spiders than ear-wigs or gnats in my house. I even named a couple of the spiders and knew where they lived to avoid them. lol) If you must get rid of them, sticky traps ar the best. Be very careful in cleaning them up - make sure the spiders inside are dead or you could get bitten.
Check out the website http://hobspider.org for more information on dealing with hobo spiders, preventing bites, symptoms of bites, etc.