The way I like to think of it is this example. For clarity of explanation, let's assume these ones are mutually exclusive. (IRL, they may overlap but need not be). Let's assume the user wanting to increase privacy/security/anonymity is the 'sender', and the receiver is your threat model.
Privacy - you receive an unlabelled box. Upon opening the box, you can't exactly tell what is in there, only something. There's a receipt (which would tell who ordered it), but you can't read it.
Security - you receive a box from a sex toys store. You try to open it, but it takes way too much effort, so you don't bother.
Anonymity - you receive a box from a sex toy store. Upon opening it, you only find a sex toy, but don't find a receipt (or there are many, but you don't know which is the real one).
Bad practice would be to receive a box, clearly labelled as from a sex toys store (and it also is a sex toy). It's easily opened and you find a receipt telling you who ordered it.
Good practice is that you receive an unlabelled box, can't open it, and if you somehow managed to open it, you don't find a receipt. At most, you'd find there's something in there, but what?
Would that be a good illustration?
Not sure.
How does it feel?
The laser also stops hurting the second it stops. But at worst, every zap feels like a painful electric shock. Think when you have static electricity from rubbing a balloon and get shocked by it. But that x8 worse. Coupled with a hint of the feeling of stabbing and pinching hair out with a needle (like one can do manually).
What I tend to do is get an ice compress on the lasered spot and communicate with my laserer to stop and pause, then after about 20-30 sec to 1 min, continue.
The closer the to-be-lasered hair is to the bone, the more painful it is. Some areas you can laser through in one time (ie., w/o needing an ice compress break), others I felt I needed to pause after every three zaps.
A session usually lasts about 15-45 min, depending on how much you rawdog the pain. The most painful are the moustache and front leg area (and the groin), the rest is much more doable.
What to do w/ lasering
Depending on what kinda hair you have, and on your goals (completely gone or soft?), it may require more or fewer sessions. Dark hair is easier to laser than bright. You might need a particular type of laser (iode, IPL, etc.). Shave a day before lasering, and after laser, smear aftersun on the area and don't expose it to sun. During your area's summer (in terms of sunshine and solar intensity), lasering is not handy. Hair grows back in a cycle of 6 weeks, so it's best to laser again after that if you want that.
Reimbursement
Some countries' laws allow you to get the laser reimbursed, perhaps w/ specific insurances, so go check that. You might sometimes need to send pictures for insurance though, and they might formally only reimburse part of the body, which is annoying bullshit considering the dysphoria.
I had the luxury that I could reject to send those pics, but still.