I am looking to print one or two of my pics, and I've heard it can be very finicky trying to capture the contrast in the image and get the brightness to shine through on paper. Anyone have any tips/suggestions or a website that walks one through how to go about preparing a file for printing?
If you can get ahold of the ICC profiles for whatever printers will be used to print your images, then using that, along with Photoshop's Print Proofing capabilities is the best way to tune any image for printing on that specific printer.
I used to do my own printing, and I've used a few different printers over the years. I even purchased a full calibration system so I could calibrate my computer monitors as well as my printers myself, for any paper I might want to use. In the long run, outside of a few rare papers that did not have ICC profiles available online, I found that official ICC profiles from most paper manufacturing companies were usually excellent, and I did not need to produce my own.
I spent a lot of time using the Photoshop print proofing capabilities when I was making my own profiles and doing my own prints. I don't know of anything else that will give you quite the same kind of "as if it was printed" on-screen preview of your images, or show you things like true paper white and black points, and how printing with a particular printer and paper (i.e. the ICC profile) will affect your colors as well as contrast, details in the blacks (in particular, a key issue for astrophotography), checking for out of gamut colors (often a problem, particularly with magenta, deep blues, deep reds, yellows, etc.) It takes a little bit of getting used to, and learning how to choose the ICC profile you want to proof with, learning how to enable out of gamut warnings (as well as how to correct those kinds of issues), learning how an when to use paper white an dMax black point settings, etc. Once you get the hang of it, though, IMO there is no better way to properly and optimally tune an astrophoto for print, on any printer...so long as you can find the ICC profiles for said printer and PAPER SELECTION.