Buy high-quality vinyl

I drive a 2015 Ford Mustang, and I'm aiming for a sleek, aggressive look. I want to add some matte black racing stripes and maybe a few smaller decals with some intricate designs. The problem is, I'm having trouble finding a reliable place to buy high-quality vinyl. I've heard horror stories about poor-quality vinyl peeling off after a few weeks or fading in the sun, and I definitely want to avoid that.So, I'm reaching out to you all for recommendations. Has anyone here had good experiences with any online shops? I'm looking for a place that offers durable, high-quality vinyl that can withstand different weather conditions and won't damage my car's paint. Additionally, I'd love it if the shop had a good variety of colors and designs to choose from.
One shop I came across in my search is vinylcutter.eu. Has anyone ordered from them before? They seem to have a decent selection and the prices are pretty reasonable, but I'd love to hear from someone who has firsthand experience with their products. How's the quality? Is the vinyl easy to apply? Does it hold up well over time?

Also, if you have any tips or tricks for applying vinyl, I'd be grateful for those too. I've watched a few tutorials, but I'm sure there are some nuances that only come with experience. Any advice on how to avoid bubbles, the best tools to use, or how to ensure the vinyl sticks properly would be amazing.Thanks in advance for your help! I'm really looking forward to giving my Mustang a fresh look, and I want to make sure I do it right. Can't wait to hear your recommendations and advice.