Using professional services or assistance to build a house may seem unimportant to some people. A lot of people think that using the services of architects, contractors etc is not necessary and will only increase the costs of building a new home. To perform all the tasks required for successful construction requires many different skills. You should only assume the parts of the build which you are confident you have the relevant skills to complete. If you are not skilled in a particular area you should hire a professional. Taking on too much in an attempt to keep build costs down can actually work out more expensive in the long run.
You should honestly assess your own skillset. By planning correctly at the start you can identify any aspects of the build where you will need the help of a professional contractor. You can then concentrate on successfully completing your aspects of the build whilst being sure that the other elements of the house build are also completed in line with your requirements and timescales.