What are you transferring from? A bottle with narrow neck, or wide-mouth jar? You can always pour the liquid into a pan or wide-mouth jar and syringe from that. Actually I do this without the needle attached, but that is because I use 100% VG-nic.
A flashlight on its side or a desk lamp will add enough light to see the top of the liquid so you don't over-fill. Glad you brought up the light issue, as this is something that can be a big problem.
A funnel is probably the best thing, but pour very slowly and check the level rising.
I use a cookie sheet for spills, but I don't use sand. I do have a roll of paper towels at the ready.
Sometimes if the mouth of the large bottle is small, I just pour from it to the small amber bottle, but this requires skill, steady hands, and learning to move your eyes, not your head while doing it. I steady one hand with the other while pouring.
Hopefully you have a box of gloves, not just one pair, but if that is the case, and you get nic on the gloves, wash it off right away, gloves on hands, and dry them off before continuing. Too easy in the middle of it to rub an itchy eye. Itches know when you cannot scratch, and they mock you!
You want to leave about 2 mL of headroom in a bottle. This may mean you are pouring actually a bit more than 30 mL, since bottles usually are measured to where they start to taper in, not the full bottle capacity. You can eyeball this headroom. Just a bit to allow for expansion.
PG is much easier to transfer than the unthinned VG I use, so just be careful, focused, sober, well-lit, and you should be fine. It will feel fantastic having all those little bottles ready for enjoyment in the freezer! And I'm glad you are trying the eurodroppers. I think you will like how they work with a syringe (you may have to force the needle
through the first time).
PM me if you want more guidance. Good luck!