The biggest thing here is practice, practice, practice. You can do it!

If need specific instructions on how to mitre:
   • How to Mitre Tile for Beginners: A Co...  

Tenax epoxy and pigment kit:
https://amzn.to/3VjC0ve

Epoxy I use here:
https://amzn.to/3VhdOt5

Sanding pads:
https://amzn.to/3IVZ7Vj


**the links above are amazon affiliate links. If you purchase through them, I will receive a small commission at no additional cost to you :)