Ok, the easy answer is to do this as soon as possible, if you are pre HRT, do it now. Forget the DIY kits, they are designed mainly for cis women. We have different skin and hair and they are, simply put, rubbish. Our hairs are buried a lot deeper and we need the relevant more powerful without burning treatment for this reason. You need to seek the advice of a practitioner that knows male skin and hair and the most effective way to get rid of your beard. Confidence wise, you will not believe how much it helps to 'pass' (as long as you have worked all the other bits out too). Beard removal is high up on the list to get done. It does not matter how much FFS, HRT or GRS, boobs you have had done, if you have a face full of hair, you are going to look like a man with makeup or a woman with a blue face and too much make up and alarm bells will start to ring.
It is going to cost a lot.
Passing as a guy can be done. As you probably know, just because you removed your facial hair does not make you a woman without all the other traits to go with it. You will just look like a clean shaven man pre HRT if that is what you intend to pass as.
For dark hair and light skin, laser first, then electro to tidy up all the light hairs.
Check out the hair growth cycle to see why some hairs come back after a while. It takes a long time to treat the whole face. I have been told by my practitioner that if you put a fingertip on your face, hiding under it is something like 500 odd hair folicles. Very dense. Eventually it all gets zapped.
If you intend to do DIY, buy one of the professional machines for the job. Be prepared to pay a lot of money though. If the DIY things like Tria and No No did the job, the professionals would cut their overheads instead of spending tens of thousands on the machines that actually work.
Unless you like the biblical, bearded lady or the George Michael look, what is the point in a beard ? I only buy a rasor to shave below the neck now and HRT will soon take care of that. No regrets here.
Hope that helps.
Nikki