I did a Mech Eng degree so used Autocad and this is pretty similar (although they do call some functions different things) but if you've go no experience then, as with anything I guess, it can be a bit of a steep learning curve. It's by the people who do Solidworks and there are tutorials on the web, they do a 186 page getting started PDF which does what it says on the tin!

DraftSight Functionality Tutorial Videos - Dassault Systèmes

http://www.3ds.com/fileadmin/PRODUCT...RTED-GUIDE.pdf