to remove your piles..
Depending upon the glue used, you can dip the piles and first 2"-ish of the shaft in boiling water, failing that, heat them gently, just the tip, not the shaft of the arrow. A gas cooker should do the trick, failing that, a blowtorch.
Don't forget pliers....
and when refitting the new piles, they stay hot for a long time...so fit the pile and then leave alone while you have a cuppa
Increasing the weight will help, as will increasing the weight on your fingers.
You might find that if you pick a not busy day, the same people that sell you the piles will fit them....
T.