If you are not sure about anything, don’t hesitate to ask and find out before you give the go ahead.
Try to use local contractors incase you need them at short notice. Finding Contractors
Always keep your business relationship and personal friendship separate
Shop around for everything. Buy the best quality cheap not cheap quality.
Always ask for a discount, you might be surprised.
Do remember, if it sounds too good to be true, 99% of the time it is.
Do build the biggest possible size you can afford as it would cost less if done at the initial stage rather than an extension later on. Schedule & Cost
Do as much as you can yourself to save on cost if you are sure of your capabilities.
Allow extra time for completion incase of sickness or bad weather, use your judgment