Well, I'm sure Will has lectured you about the loading/unloading in total darkness....and there's no way around that. We're talking Kodak HIE, right? Not Ilford's faux IR film, the SXF? That film is much easier to use, and comes in 35 as well as 120. But it's a slow-rated film, so heft that tripod when you use it. But you may be able to get your feet wet with it, and not have this trauma!
I love Kodak HIE, for all its pesky little ways. Will shoots gorgeous portraits with it, rated at about 200 (isn't that right Will darlin'?) while I dig the stark outside images, rated about 360. That interior diner shot I would never have been able to grab on the fly like I did with a slower film. I wouldn't have wanted to draw attention to myself by using a tripod in there.
Yes, #25 red filter..... listen, there's a lot of literature about focusing and looking to change what you've focused to match the red notch on your lens (if you have one) - but I've never done that, and have no focusing problems. (Again, shooting mostly outside, it's not such an issue, but for the interior diner shot I went with my eyes on the manual Pentax ME).
Speaking of manual - I use the ME because newer cameras come with the infrared film advance thingy that fogs HIE. Supposedly you CAN shoot HIE with it - if you compose your image, then take 2 steps back, any fogging will be along the edges, presumably to be cropped out later. But I'm afraid to ruin a roll of film testing this theory in my Pentax MZ-S, so I can't say whether or not that really works. I stick with the ME and am grateful my new lenses fit it.
Just load it in darkness and make your first roll pretty simple. If you plan on shooting outdoors, wait for a semi-cloudy day so you can enjoy the effects of the black sky and groovy clouds. (Will especially loves this. He told me so his own self.)
Can't wait to see your stuff - have fun! I'm sure there's more I'm forgetting, but really, don't freak out, pop on that filter and go have fun!