(If this post should be under Walls or another category, please let me know.) I'm taking my first DIY stab at changing the clamshell-style trim on my main floor, as it's old and doesn't match the trim on the second floor. I used a trim-removal tool to pull off the old trim, but it was brittle and left some pieces behind. What's the best way / tool to remove the rest of the old trim and prepare to lay down the new? Thanks so much!