Here’s one from PacMoto. It will give you a good idea of how to do the front brakes. He’s not as thorough as Boxflyer, but it should give you the basics. If you have any specific questions, feel free to ask here!
https://www.youtube.com/watch?v=-5_9ANHkPJg
It’s for an R1200RT, but I believe it’s the same for the R1250RT.