I have been a professional photographer for many many years but I am interested in real estate photography as opposed to family/senior. I am having a really hard time getting my verticals right and I would love to perfect this before going public. Do you have a resource (blog post/video tutorial)? I searched your blog and most the posts on this subject are really old, I didn't know if there was update software or hardware to help.
Kelli is right while I've done a lot of posts over the years on the subject of verticals I've not done one since Lightroom 5 has been out. Since the release of Lightroom 5, it is the best and fastest way to straighten verticals. There are many other ways to straighten verticals, but Lightroom is amazingly fast and easy. This single feature is worth the cost of Lightroom for a real estate photographer! The Lens Corrections panel contains everything you need to quickly straighten verticals and horizontals.
I find that if I just get the verticals close in the camera that a click on the Auto button in the Lens Corrections panel gets them right on during post processing. This Lynda.com video tutorial explains all the features and details. Note that there was no changes in this area between Lightroom 5 and 6/CC.