There are some excellent crafters in this world whose embroidery looks as great from the back as it does from the front. I am not one of those crafters.
My philosophy about felt crafting embroidery is as long as it looks neat from the front, the back doesn't matter. I'm all about gettin' it done. I'm just showing you guys this so you don't sweat that part. I've heard from crafters making the Twelve Days ornaments who actually worry about this! Bless your hearts.
I design the ornaments so that any knotty, tangly wrong-sided messes are always hidden in the end. The only thing you need to do in this ornament series is make sure you have no anchor knots on the front. Make the back as ugly as you like! Snip the long ends, tuck in any stray threads, and forget about it. No one's going to see it (unless you publish a shot of it on your blog).