Kit

Luckily tennis elbow braces are pretty simple so you should be okay ordering an affordable one off Amazon, or you might be able to find them in a local pharmacy or even sporting goods store.

I found this video from a physiotherapist where he shows how to put one on and also talks a bit about use cases and precautions (I don't think what he says about wrist braces is PARTICULARLY well-supported but otherwise I think the video's fine) https://www.youtube.com/watch?v=DMXIyUXb31E. If you really feel like you need professional instruction figuring it out or if you have questions he doesn't address, a PT would be the person to go to.

In general, the things to keep in mind are:

• The padded bit goes on the outside of your forearm at roughly the site of pain
• It should be secure but not tightened as far as it'll go. If you're getting swelling, numbness, or tingling below the brace you should tighten it a bit until it's comfortable
• These aren't for all-day long-term wear like an ankle or knee brace. Try to limit yourself to wearing it whenever you're doing activities that would aggravate it, anything that involves a lot of gripping, squeezing, or repeated elbow bending. Aim to discontinue use after 4-6 weeks, or after symptoms have resolved to your satisfaction