@terraboops laser can work okay for people with light skin and dark hairs. It's similar to epilation in that the hair will fall out but probably regrow after its dormancy period. It is not considered a permanent hair removal method by the FDA and thus inappropriate for presurgical work. But it can affect a very large area quickly.
Electrolysis works on individual hairs. A probe is inserted into each hair follicle, and then a combination of electricity and heat is used to kill the follicle, below the skin. This shouldn't result in any surface damage to the skin other than some temporary reddening. The hair is removed after being zapped, and the electrologist moves on to the next follicle. It's more painful and takes longer, but a typical electrologist will have a follicle kill rate over 95%, much higher than laser, so you only have to treat the hair follicle once in most cases. And for anyone with even slightly brown skin or with light colored hair, this is the only option.
Either way, it's going to take a while. Hairs have a dormancy period where they just won't produce a hair for weeks or months and then start a new one, so it can take a long time to know if you're getting permanent results or not. It's a marathon, not a sprint. It's uncomfortable and expensive. I've been getting electrolysis on my face for 3 years and I'm not done, and I'm adding surgery prep work to the mix which is going to slow down my face even further. But when I do have to shave, the process is so much easier, and there's no shadow in the areas that have been zapped.