If there are no properties or land involved you could have a decent stab at doing it yourself.
Also, have a look at whether the banks and institutions will release funds without the necessity of a Grant of Probate.
My father passed this year and the bank and Life Insurance released funds without a Grant (up to a certain limit). All I had to do was provide a certified copy of the will and fill some forms - I am the named executor in the will.
When I was doing will administration many years ago, the fee charged by the Solicitor was charged as a percentage of the value of the estate.
Things may have changed but it would be well worth your while to try get as much work done yourself, in terms of realisation of assets, which will result in less work for the Solicitor to do.