I don't think there needs to be direct uniformity here. It is a fairly accepted fact that the blinds in the glass are going to be much smaller in all of these applications.

I used blinds.com for woven wood cordless Roman shade and a Top-down bottom-up pleated blind for a bathroom. The instructions for measuring are clear, and if you can use a measuring tape, drill and screwdriver, you can install them yourself. I installed all of mine, including 2” wood slat blinds, and only needed help with the very large woven wood ones that I could not hold up by myself. check out their prices, also the local guys for an estimate, and maybe check out americanblinds.com for prices. Either company will send you free samples of colors and finishes and their customer service is good, in my experience. It’s not difficult if you are at least a little bit handy.

Most blinds can be surface mounted to the trim and hung as an outside mount. Its not ideal, but most of the 2x4 walls out there today won't accommodate an inside mount. You'll need some screws, washers to shim the brackets flush, and a properly sized drill bit to drill through the casing so you don't split it.

We want cellular blinds as this is an addition with 10 windows & gets very cold. They will add insulation. That is a swivel rocker and only place we can have it. We cannot use any other walls due to a sliding glass door and small wall with TV/fireplace in the corner. The chair is to face the TV but can swivel in any direction. There is plenty of space to walk past it to the door. We already planned on getting a corner lamp. Just set up the furniture this weekend. Looks like we will be getting a bigger rug too. Just not sure of size.