If you are writing something that requires a lot of research, don't let that put you off. Here are some common misconceptions:
1: You have to know everything about your topic.
Actually you just have to know the basics and then some specialized details. Details are what makes a scene, a book, a movie come alive.
2: You have to go there.
Sure, it's great to go to the locations you plan to use in your projects, but it's not absolutely necessary. These days you can find a wealth of information on just about any location in the world, on the internet. Check Flicker for photos, search for blogs about that location, etc. Also check to see whether there are relevant documentaries you can watch.
3: It's hard to get help
Actually, experts (such as professors, doctors, lawyers, etc.) usually are flattered to be asked for their help. Ask them specific questions. Ask if they are willing to read one chapter or section--not too much, they're busy people. But if they say yes, send themthe whole manuscript or script, they may read it all.
4: You have to do all the research before you start.
In fact you can do some general research and then dig up the rest as you encounter things you need to know.
Don't let the need for research stand in the way of telling the story you want to tell!
(For friendliy guidance in writing your book or script, get a copy of Your Writing Coach, published by Nicholas Brealey and available from Amazon and other booksellers--the new edition is now available!)