Whether or not you require a lawyer for a work injury depends on the nature and severity of your injuries.
For example, if you have a minor injury and only need reimbursement of medical bills and lost wages for one or two weeks, and you expect a quick and full recovery, then it is unlikely you will need a lawyer.
On the other hand, if your injury is likely to result in long-lasting physical impairment, pain or disability, or you are considering making a common law claim, you will likely need a lawyer to assist you, as these claims can be complex.