scottswatches's post in Bulova Accutron service/repair in EU was marked as the answer
You SHOULD be able to send a watch to the UK for repair without the UK person having to pay duty, and you paying duty coming back to Luxembourg. However, my experience in the past six months is that customs duty is being applied to everything each way, which you have to pay and then appeal.
I think they assume everyone is lying until proved otherwise.
scottswatches's post in Advice needed on a basic set of watch oils was marked as the answer
This is a big can of worms, as watchmakers all have slightly different ideas, but this is what I use
8000 on the pallet jewels
D5 on pivots (and pin pallets)
8300 (grease) on springs and levers.
Some movements will specify different oils and greases for different applications
scottswatches's post in Becoming a watchmaker was marked as the answer
If you did go down this route you will find plenty of work. Many watchmakers are at retirement age, and too few trained during the quartz years to keep up with demand now many people want mechanical watches.
I have done courses at the BHI and would recommend them. They also do distance learning courses. As well as the cost of the course do factor in coming away with a list of tools you will want to buy that will run into several hundred pounds. Many things can be bought used, such as staking sets, which will save you hundreds of pounds. But you can easily burn £200 on just screwdrivers and tweezers. And oils cost a small fortune!
scottswatches's post in Regulating - tips for moving the arm in REALLY small steps was marked as the answer
A very steady hand
I prefer to use the fork end of a spring bar tool to make adjustments. Lots of watchmakers use tweezers though. And adjust the beat rate error first before the timing, but you will need a timegrapher for that.