Yes! Most homeowners tend to use interior designers to achieve their "dream home". But it's not that difficult to be involved in the decision processes of your home design - just invest time in your concept and relay it to the direct contractors. Most of the time, the good and experienced direct contractors have design knowledge too from building so many other houses.
If anyone needs contacts for tiling, aircon servicing, electrician, plumber or handyman services direct contractors, here are my trusted contacts:
Tiling Contractor
Aircon Servicing
Plumber
Handyman