Scalping is "too" hard, I mean sure there are some people who know how to do it, but if you ask me it's near impossible for me to do it. I tried it a few times before and I failed and I have been trading for years now, so that means any newbie out there would have absolutely no chance at all, would not make any logic to do it.
I think some few things outside scalping itself can be attributed to the reason if people say it is too difficult. This can be as a result of :
1: Emotion: When you are on a scalping trade you are between the good and the bad because if the order is profitting, you want to allow more profit but this profit can revert to losses in your presence because of delay to exit the trade in profit.
2: Network: This can become another worring factor if you don't have steady network because you need to be sure the network for scalping trade.