You might invest in a simple combination Cheshire available at any good astro shop. Here is one such:
http://www.bintel.com.au/Accessories...oductview.aspx
But you can get them nearly anywhere. Then just follow the instructions or do a search, or call back here if you get stuck.
Honestly, with a few noteworthy exceptions the combination cheshire will meet all your needs and give you reliable results.
regards