The default answer is no. If you can amicably speak with your neighbour and come to an agreement as to where the boundary line lies, then there is no need to instruct to surveyor on that occasion. You may wish, however, to enter into a boundary agreement, just to reflect the agreement reached with your neighbour there as to the position. However, if that can’t be done and there’s no prospect of an amicable resolution with your neighbour, then it is generally sensible to instruct an expert to prepare a drawing as to the location of the boundary line. Again, you can then present that to your neighbour and see if they are agreeable to it. Otherwise, it may be that you potentially need to look at other options in order to enforce the position of the boundary line as determined by the surveyor.
