Bathroom Rebuilding

I Am Looking To Do My Bathroom But Want To Avoid The High Margin That Stores Charge You When They Do The Whole Thing Themselves - I Know You Can Save 30-40% If You Co-ordinate Yourself But This Is A Nightmare When We Are Both Working, Is There Anyone Out There Independant Of A Store That Can Help Co-ordinate The Whole Thing (bit Like Wedding Co-ordinators) - Or Does Anyone Have Any Good Tips ??