Unpacking DLLs

Hi guys,
Can someone write a tutorial on unpacking DLLs. I have seen a prog for doing this but it doesn't work in 98SE. I tried running the program. I had unpacked the program itself. But inbetwen, it loads the DLL using LoadLibrary. Olly tells me the code section is compress blah blah. Then olly gets an exception or something. And either LoadLib returs zero or the proggy crashes. Though PEid doesn't say anything(Nothing found*). ANother DLL in the same proggy uses PETite. Can someone give me some pointers?

Thomas Antony