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If your Bike Shop has a Cotter press, rather than brute force, you may be able to Re use the cotters..
if you destroy the cotters you have to buy new ones, they are not a No Brainer to replace.

It is common to carefully File the Wedge on the cotter to get the fit right.. and it is soft metal. there were special cotter vises to hold the round cotter in a bench vise..
But with a vise to hold it you can accommodate that.

so after per shaping the cotter to fit, a few modest hammer blows tightens it,
then you snug down the nut,
don't try to pull it in with the wrench on the nut..

Now you know why nobody strips the cranks off those bikes
when they are locked up and abandoned.