I don't put up a tree due to the kitties but MOSTLY due to putting up five trees in three stores, I'm pretty much done! I can attest to the fishing wire idea. That's how we secure tree's and wreaths at the store. Each thread holds about 30 lbs. I've never had any "cutting" issue as it's not that sharp. I do take out my breakable ornaments and hang them with ribbon across my sliding glass door at various levels. That's my decor.
Regarding pictures, come to my store and use our trees as background! LOL! Lord knows you wouldn't be the first!
C