I was working on an order for 30x45 and 40x60 prints and thought it might be helpful to give a look at the steps I follow when profiling for optimal colors, brightness and contrast (soft proofing), creating small test prints (hard proofing), enlarging the image and making sure the full-size image is as clean and sharp as possible before uploading it to the print lab.
In the video I soft proof in Lightroom. I also have an older video where I show soft proofing in Photoshop:
https://youtu.be/ND_GzCueX4s
Some hard proofing tips:
https://youtu.be/43_v6olWyQc
Some basic printing workflow tips:
https://youtu.be/a1SWnFTO8YQ
I also mention HD Aluminum Prints in the video. Check them out: https://www.hdaluminumprints.com/