Well that depends upon what you are thinking about doing. Remodeling can be very expensive if you are hiring "out" all of the labor and paying retail for the materials. This is the reason programs such as DIY and This Old House have become so popular. It's not unusual for remodels to go over $100,000!
I would recommend that you try to do whatever you can do yourself. Some things don't require as much expertise as others (taking out old carpet, sanding and scraping walls, taking out old plants,cleaning etc). Then take bids from licensed contractors for the remainig work. That's the only way you are going to know for sure, what things will cost.
I would recommend you take a look at http://www.angieslist.com for contractors. Angies is like a referral service from homeowners. The homeowner will post their experience with a tradesperson, and the tradesperson is rated. You cannot pay to get on the list, someone who has used you has to recommend your work.