I'll go against the prevailing wisdom and point out that it's really pretty easy to build or rehab a boat and well within the abilities of anyone who can chew gum and walk at the same time. Really it's all simple DIY kind of stuff. Just a whole lot of it.
The problems most people run into are self-induced of the making-a-simple-thing-complicated sort.
Take this boat for example...
|Tad Robert's Laura Cove 28|
|Yann Quenet's SKROWL 900|
|Dave Z's TriloBoat|
They are all pretty cool boats and should not cost you any more than $15K to build or take any longer than six months of fairly simple but industrious work. All you have to do is follow the plans and simple directions.
The only reason it would cost you more or take longer would be self-inflicted and has nothing to do with the designs, boatbuilding, or the relative weight of air in your chosen location.
A simple boat, simple skill set, and the ability to complete simple tasks in a timely manner is all you need.
The only thing holding you back is, well, you...