nice work if you can get it

If someone says it is nice work if you can get it they mean to say that it is something you can earn money with fairly easily and fits your current skill set, and is something you would do if you had the opportunity. It is nice work if you can get it is typically spoken by the person who wants this type of work and wants to make a point that the work is hard to find but if you can, it is good work for the money.