We have done plenty of guitar work for customers by post/courier.
Email or call to discuss what you want, then send your guitar to us, then we'll give you a call to discuss the plan of action once we have had a good look at it and agreed what you want doing and a price. Then just arrange a courier collection to have it returned.
Our furthest away customer was Cata from Romania who couldnt find anyone nearer to install a Lo Pro Edge7 trem and some custom colour Dimarzio's to his Ibanez(see picture). He was VERY happy with the job.