Dont worry if you dont speak the native language as the people there can normally understand basic english and gestures.

As for the tax, it is not compulsary although they would have you believe otherwise. Just dont declare it to them when collecting your main luggage and just keep it hidden. It is not law there, its just a few airport officials trying to make extra money for themselves on the side. If you do end up having to pay, dont pay much and just say that you only have £10 on you and nothing more and say your family are collecting you therefore the family are providing all expenses. They will just accept that as payment and let you go as that is the maximum they can get out of you.

First time i travelled to Bangladesh on my own, i took some old mobile phones for relatives and as i had them in my main luggage, i ended up paying £20 because thats all i had at the time.