I have always broken in my gloves with oil and practice. I decided to hurry this one along by using the suggested oven tip I have heard about in the past. “Oh, just put your glove in the oven!” I never believed them, because I feared it would catch fire. I thought I was wrong. My Easter was ruined today.
Edit: Here is the link that says 15 minutes at 350F: https://ecosports.com/blogs/vegan-athletes/how-to-break-in-a-baseball-glove
I prefer to do mine on the grill with a few pieces of a louisville slugger Maplewood bat on the coals. Instead of 12 hours though I wrap mine in foil at about 7 hours when it hits the stall.