I have found that with careful installation and attention to detail, a plain hand pump is enough for tubeless.

I had my doubts when I first did it without a compressor but I was thousands of miles from home. It worked fine.

I've done it a dozen times since then. Never failed me.

I will say that if you're using narrower rims or doing an off label tubeless setup, the compressor helps. Otherwise, it's just necessary.