Explain to me there skill level? where to they get their info...

Explain to me there skill level? where to they get their info from before making decisions? it certainly can't be inside info i'm keen to hear? what about management fees in this environment?They are responsible for the fund and where to invest the fund pritty much a portfolio structure.There's different varations in the title but in a nutshell most of these things we can do ourselves as investors.We just need to discipline ourselves and stick with the plan.How much more do they differ from us.Happy to hear your thoughts?