We do a lot of DIY, but DH is a licensed builder so I'm cheating a bit when it comes to credentials and experience.
My happiest surprise success thus far has been painting the kitchen floor. The previous owners installed dollar store sticky-back tile when they were prepping this house as a rental and they were hideous and starting to come loose. But the full remodel of the kitchen will change some of the cabinets' footprint and add some built-ins, so we didn't want to do our long-term tile vision until we have those things in place. So we stripped it down to the subflooring, patched a section that had water damage from a leaky fridge, and used an outdoor patio/deck paint and two coats of clearcoat. Now our floor is a lovely dusty gray-blue color and it is holding up quite well. More than well enough to get through the couple-few years until we tackle the full kitchen remodel.

We had those nasty cheap tiles on our kitchen floor too.
Took us 5 years to decide to finally do something.
We pried them off, found nice hard wood floors, scraped the glue off, rented a sander and sanded and re-finished the floor ourselves.
We also put in a brick floor and wall around our wood stove in the kitchen.
That really warmed up the kitchen- pretty honey colored wood floors and warm temps in the winter.
We also stripped the ugly blue paint off our kitchen drawers, painted white over the blue on the cabinets and replaced the ugly chrome pulls with antique brass.
Love my simple farmhouse kitchen.
This spring and summer we transplanted about 200 sq. feet of perrennials out from in front of our farm house, dug out a nice base, installed landscape cloth, gravel and sand for the foundation, then laid our brick terrace.
Looks like half a million bucks!
We've done lots of painting and decorative finishes in different rooms.
Our next inside project will be a bathroom remodel upstairs, probably in another year as right now we are focused on outside projects.
We did a barn makeover this weekend- transformed our 40' x 15' tractor shed from barn red to white with green roof.
You can see pictures of some of those projects at
www.virginiapecans.com
Look in About for the pre on the barn and in Farm photos for brickwork and the after on the barn and the kitchen.