You will love not having to climb behind the couch to adjust the glare on the TV once these are up. January is the best time to look for custom blind sales since manufacturers and installers usually drop their prices right after the holidays. The whole measuring and install process takes a couple of weeks from start to finish.
Before you commit to a price, get at least two different quotes from local blind shops or installers so you know you are getting a fair rate. We want this upgrade to feel seamless, both for your windows and your bank account.
That 0% intro period is a hard deadline, not free money. If you still have a balance left when those 15 months are up, interest kicks in on the whole original amount retroactively, which defeats the point.