Hire a Pro with a snap cutter. Mosaics fall apart in a wetsaw. It dissolves the glue that holds it all together, and can stain the marble. Pros don’t use wet saws for that. And they flatten the walls before they start.

https://www.ceramictilefoundation.org/homeowners-guide-to-hiring-qualified-tile-installer

For starters You selected material that is extremely difficult to install for a first project. Actually difficult for many contractors. You plan to purchase a wet saw that is junk and will make things more difficult. You want a moving tray for mosaics. Spend a bit more now. It's worth it. I strongly suggest the Porta cable for a small saw. This link will give you a demo.

https://www.bing.com/videos/search?q=PORTER-CABLE+PCE980+Wet+Tile+Saw+video&&view=detail&mid=C85BA5FCA3572B55A79DC85BA5FCA3572B55A79D&&FORM=VRDGAR&ru=%2Fvideos%2Fsearch%3Fq%3DPORTER-CABLE%2BPCE980%2BWet%2BTile%2BSaw%2Bvideo%26%26FORM%3DVDVVXX

Yes you will cut individual pieces around the outlet unless you plan on purchasing a angle grinder with diamond blade also. Don't forget to notch for screws. You need a lot of wedges. A good rubbing stone or diamond pad as all cuts need to be smoothed prior to installation. Determine which type of sealer you prefer and apply 2 coats prior to grouting without getting the sealer into the grout joints. How will the ends be finished?

I urge you to hire a professional for this project as it will test your patience. If the material was purchased at a box store most pros won't touch it. Odds are the quality of material will also add to the difficulty factor.

If you go for it I wish you luck.

Thank you.

Ha! I like the fan idea. I watched that Porter saw video earlier actually. Have to see if I can stretch my budget. I was planning on having a towel there to dry sheets off with after cuts. I am using Schluter simple white trim on both sides and tile is from marble tile supplier not big box store. It's my second backsplash and first was definitely simpler, but I'm up for the challenge.

We’ll assume the worst if you don’t come back and post an update 😜 so be sure to tell us! Good luck.

Here is a recent thread that has some lessons in it about installation of a herringbone tile backsplash. I actually can barely look at the pic in the OP; it gives me vertigo.

https://www.gardenweb.com/discussions/5886990/crooked-marble-herringbone-backsplash-install-acceptable#n=41

How did your project turn out? I’m getting ready to do the same thing with all white herringbone. I love the look :)

It turned out fantastic.

I just love it. It's little more complex but not as bad some on here said.

Liked it so much that i'm

doing it again in my new home.😊

doinfdoing it again in my new home. doinfdoing it again in my new home.