Yes you can use someone on the outside. I made my own centerpieces to save money, I was quoted about $60 a centerpiece but did it myself for around $13 plus shipping. I bought candle holders for floating candles, mirrored tiles, crystal marbles and tealight holders. Emily then scattered petals around. This saved us alot. I shipped everything to her and she charged me a 1/2 hr labor to set up. Alot of my guests took the centerpieces home so I didn't have to worry about shipping them home. I have one set up without water in my curio cabinent with other things from our wedding day.