Would I benefit from a personal trainer? please answer if you have a personal trainer/ or experience with one?

I'm interested in getting a personal trainer but I want to make sure my money is well spent. I am trying to lose 30 lbs and want to get really toned! I know I am probably capable of doing the same exercises they give me on my own, but i'm hoping it will give me accountability to continue to workout in anticipation of our next session. Will a personal trainer really help me? I want to know the results you got and the length of time you spent working with a personal trainer? 1 month, 2 months, etc.? and do you think I should try to lose my 30 lbs and then get a personal trainer or get one right away?