Well, your lawyer in Egypt should formulate the power of attorney bilingually in your name, then send it to you by email.
Then you print it out and follow these steps (Originally written by a client who is also a barrister in London):
1/ look in Yellow Pages for a local notary public (NP), who are always lawyers in practice; there is one at least in every small town and many more in cities
2/ Take the PoA along with passport and sign name in front of the NP who will then add his signature and details. He will want paying cash which is normally about GBP20.
3/ Take the PoA along, or post it to the Foreign and Commonwealth Office in London
Legalisation Foreign & Commonwealth Office who will check the NP's details on their database and legalise the PoA by apostille. This costs GBP27.
4/ Take or post the PoA to the Egyptian Consulate General in London
http://www.egyptianconsulate.co.uk/ who will then check everything over and will legalise it in Arabic. Cost of this is GBP20.
5/ Post the PoA to you by recorded delivery or better still by DHL or the like.
The above is really very straight forward and in fact there are companies that will do 3/ and 4/ for people at a relatively cheap price as they do so many a day; details can be found on the internet.