You would have to borrow Whippy to make a contractor afraid
That's one reason I'm glad to be a DIY person -- I hire outside for fairly few things.
Electrical takes care but I've done a lot of it over the years. Plumbing is just a royal pain to me, but I muddle
through it, expect to have to tweak any install after the initial evolution (last year was a new softener and filter system, totally reworked the incoming water plumbing to get everything to play nice). I've just started replacing windows on the house, but a really nice quality, full energy star window is only running about $350 plus $20 of finishing materials per window; I've consistently used a local Grossman's Bargain Outlet since buying the house, the manager always gives us big discounts on any significant project (list on the windows is something crazy, like $900+ each -- there's massive room for discounts, and these are special order, we aren't just taking things already in the store). It takes a handful of hours per window to replace, budget a day if you're really just slowly chipping away so you don't have your technique down.
I did a walkway into a little glen by a stream, plus screened in gazebo, when I got married a couple years back; we used that for the after-party gathering place, tiki lamps along the handrail

The next summer I started the addition, a sunroom with little entryway room, and deck, completed it over that winter; all high energy efficiency windows, connected it to the central heating system, full electrical, french doors between the main sunroom and the entryway, beaucoup insulation. The new 8x16 deck was done as a continuation off of the front porch, abuts the sunroom, stairs with landing in the backyard. The deck and sunroom are raised relative to ground level, so lots of support columns.
Toss in a lot of keep-the-wife happy projects, ranging from fencing in new areas for her garden, taking down trees for the garden, woodworking projects, and I've been pretty busy
