I haven't got a particular recommendation but when my DD got engaged this year I made a list of questions and priorities. My considerations were as follows:-
-did I want to go with a more glamorous outlet than my usual go-to shop, Phase Eight? In the end I kept to Phase Eight as I know their size eight fits me perfectly and the lengths are right too.
-did I want a 'fit and flare' which suits me and is comfortable, or a slinky outline which would look better in the photos? I chose a 'fit and flare' with a tulle skirt which cost a small fortune from their special fancy range. I haven't dared tell anyone what it cost but I will be comfortable all day and also (hopefully) not be like dracula's mother in the pics.
-shoes and accessories? It's a country wedding so I have chosen mid priced shoes which will stand a bit of grass. My cream jacket was bought for another wedding and will be good for this one too.
-colour? I was not going to be awkward about colour. My DD told me to buy navy and I have. Saved angst-ing and helped me make my mind up.
-hair? I have short hair with a sticky-up style so I am not going to have a hat/fascinator dilemma as I am not wearing either.
My gut feeling about personal shoppers from talking with others who have tried them, is that, if you are a nice person, you could be intimidated into having what is not comfortable. If you know what you want and are prepared to let them waste a couple of hours on you and still walk out without buying anything, then go for it.