ok, converting is a difficult thing to do if your over the age people generally haev their barmitzvah, simply because years of study has been lost.
I'm a very *very* secular Jew, (no speaky hebrew) but my grandparents felt it was their duty to give me a good long lecture about Judaism and ethics every time i visited them. my grandpa more than my nan, but the worst one was my uncle..... he went fully orthadox, and it was a long hard raod for him.
my dad's family is Jewish on his mum's side, and my grandpa's dad was Jewish, but he only 'came back' to the tradition when he married. so for my uncle, he grew up pretty secular but with a lot of the ethics and teachings of the religion being spoken about, but not necessarily followed. he decided he wanted to become a "proper Jew" (his words) and went abd found the straightest most orthodox synangogue in the country and spent about four years speaking to, learning from and proving himself a good Jew to the rabbi and all the other important men there before he was fully accepted into the synagogue.
it's my understanding that you don't really move from being a reformist Jew to an orthodox Jew by 'official' means, you must be accepted by the synagogue before you an be a part of it though, so if you want to join an orthodox synagogue you must be accpeted by it.
as for converting into orthado Judaism, it takes a lot of study, an a long time proving that you can be 'good Jew'. in the end the idea is that G-d will not exclude anyone from his community.