Hi Pelin, Technically, yes. However, the use of 'tougher' doesn't sound as smooth as the use of 'harder'. It may be a regional variation or preference, but I recommend option 1. :) Perhaps a little more formal but also frequently used is the following option: "Don't make this more difficult than it has (or needs) to be." Hope this helps, Ellen

I agree with Ellen and possibly 'harder' would be more familiar to British English speakers and 'tougher' to American English speakers - but that is a bit of a guess!

Yeah.