It is recommended. Accident liability is not something a person should handle on their own, unless you really know the laws and all related dealings and procedures.
As the first answer suggests it is advisable to use a specialist lawyer, but in the UK there are some practicalities relating to legal costs which you first consider. If your claim for personal injury is worth over £1000 or your overall claim is worth over £5000 (including vehicle damage) you are entitled to claim your lawyer's fees as well as your compensation from the person At Fault. This will allow your lawyer to offer a "no win no fee" agreement. Any less than these sums and your legal costs will not be paid and will likely be more than the compensation you are entitled to. See the related link entitled "accident solicitor" for a full description on how to know how much your claim is worth before deciding on whether to use a personal injury lawyer or not.