Is there a way to perfectly align image textures with the uv map?

If I have an external texture that I want to import onto my mesh how can I make sure it lines up with the uv map perfectly? I export the uv layout and use it as reference in photoshop, but even if I try my best to align them there’s always little bits around the edges where you can see the texture is slightly misaligned. I try fiddling with the opacity of the texture so I can see where I’m placing it more accurately, but, it doesn’t help much.