How much visible effect can I expect from just one pigmentation laser treatment?

If you search for pigmentation lasers, you'll get confused because the reviews all say different things about their effectiveness.
I have a mix of freckles and blemishes, so I'm wondering if one session of pigmentation laser will make a difference.
The hospital said I need to get it done multiple times, but I'd like to know how much of an improvement in skin tone will be seen after the first treatment.

There are many different types of pigmentation lasers, including pico toning and Revlite Synergy. Does the reaction differ depending on skin type?
I'm also concerned about side effects like pain, redness, and scabs.
I've heard that you should definitely use regenerative cream or sunscreen after the procedure, so I'm also curious about how much care is needed.

If you have actual experience with pigmentation lasers, it would be very helpful if you could share your reviews or tips for choosing a hospital.