I like ear piercing on little girls - I myself had mine done when I was two. BUT I don't like your plan. I think that unless you can agree on this issue, it would be a gross breach of trust to get it done behind your DH back, and absolutely not on to drag a third party into your scheming.

Aside from that, some of the drawbacks of getting them done so young (and it is hard to find many reputatble places that will do them so young, and definitely not without a parent present and giving consent):
* the inital pain - although this does go away, different kids have different thresholds.
* maintaining - this can be painful, and needs to be done regularly: alot of younger kids won't co-operate with the steralising and turning the earings etc.
* I 'lost' my earings ALL the time as a young child and it was always such a huge drama to get new ones put back in, in case the hole closes over.