Hardwood Flooring?

My husband and I have been wanting to rip out our carpets and have hardwood floor put in. We have been trying to get advice about it and where to go for the best prices. We haven't gotten alot of advice about it yet. The questions we have are like should we do the whole house? Should we have it professionally done or is it feasible to do it ourselves? And where can we get the best deal on it? Can anyone share their stories or advice on getting this done with us so that we can make the best decision on it all?

~Sharon