Well it depends. If it has verified experience and trading history then, based on his past trades you can make judgment about this trading performance and decide whether you want to use his service. The point is that real traders earn enough and usually their time worth more than of a mentor which tries to teach your.
Totally agree. Newbie trader should go to babypips.com and request advice from expert trader in the community. To start this business my recommend is trade with small amount until make consistence profit.