An interesting question.
There is a necessity to protect yourself in any market.
So we have a magnifying glass generally one of 3X and one of around 10X
We have a set of scales. Electronic ones are very accurate and very cheap thee days.
Vernier Calipers, electronic, are also very cheap these days.
So this is the basis of equipment.
You need research material of course and books can cost more than the coins but the interent is quite good for finding things.
I have never believed in placing older hand struck coins in any holder other than museum quality small envelopes 9same goes for machine struck) and cotton gloves if you wish to handle the coins.
A computer program for listing the collection is great.
Are professionals better than amateurs? One hopes so but given that Ansari has found an unbelievable error in an auction from a major auctioneer, who knows!