The very best thing is to ask your friends/relations/colleagues etc.,etc to recommend someone that they have used and have found good/helpful/trustworthy/efficient.
Call them and ask for a quote. Do try and not to be too overly influenced by price only. A purchase/sale is a big commitment and you do need good advice and assistance. The price you've quoted is not ( in my professional opinion) excessive for what is a reasonably difficult enough transaction. This is with the benefit of more than 20 years experience.
mf