looks like an attempt at a flat top early English checkering .
I say this because ,I see no attempt what so ever to place nice angles / points on the diamonds .
Depending on how deep it is it could be repairable , well lets correct that to , be changed .
The problem will be that the checkering will be below the level of the stock . Now if your shooting for pure cosmetic that’s not an issue but it may not be to functional .
As to a beginner / amateur being able ? Ha if this is your gun ,go for it , everyone must start somewhere . Despite what some will want you to believe No one was born with this knowledge .
But do yourself a favor and do some reading , get some pointers , build you a stock vice and don’t tey to just hold it . If you do , your going to end up with something worse or only slightly better then what you have .
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If this is a special gun and changing it yourself worries you , send it off
OR take the time to make a new stock , start learning the processes . you might just be suprised with what you can do
