this is clive here .
thanks for ur question which gives me this chance to show off .......
to enter tibet , one is supposed to fulfill a series of requrements .
the basic ones include that u can not be a tibetan in a foreign country and not a
foreign official either .
if u don't have this problem, then u could apply to the travel agency who
will do the rest work for u .for the chinenes, the identification card is needed ,
and for the foreigners ur passports or , sometimes , the copies of ur passports
r required .
it's not that hard as were reported in some programs to get the permission .
In a word , if u have ur valid passports and r not the kind of people listed above ,
and u go through the local travel agency , then everthing would be the agency's .
if u want get the permission through chinahighlights , we would pave all the way
for u . what u should only do is only to wait to enjoy .......
hope u could have a good time in tibet and then nepal .
yours,
clive