Sophie McKinna was "disappointed" with her shot put throw of 15.97m which won her British Championships bronze.
The 20-year-old from Great Yarmouth has been making drastic technical changes under new coach Mike Winch.
"I was seeing my coach on Wednesday and Thursday and changed a lot in my technique for the European Under-23s," she told BBC Radio Norfolk.
"It's going to take a week for the technique to settle down and for me to get used to it."
The 2011 World Youth Championships silver medallist McKinna is part of Team GB for the European Athletics U23 Championships in Tallinn, starting on Thursday, and is hoping to finish " at least in the top five".
She split with previous coach Geoff Capes after finishing fifth in the Commonwealth Games, and Winch has "ripped (McKinna's technique) all apart", focusing more at the back of the circle.
And despite being almost 1.45m behind British champion Rachel Wallader on Saturday, McKinna feels there are positives to take away from it.
"It's a massive positive to pick up a bronze; I'm pretty young still, and I've got a lot of time to be picking up the silver and gold medals," she said.
"To win a medal despite making all of these changes, I can't really complain."