The fact that you do not use a PC now does not mean that you might not be required to use one in the future. Technology is one of the most rapidly expanding aspects of work today. Very few occupational roles in today's working environment escape the impact of new technology.
If, however, you believe that you will not be required to use a PC, you might wish to discuss this with your employer and explain your reasons for not wanting to undergo such training.
You might wish to ask your work colleagues whether they have been requested to undergo such training and if they have, whether they have done it and what their experiences were. You might discover that it wasn't that bad. You must not lose sight of the fact that such development will add to your own skills levels.
If it is the case that you might be expected to use computers in the future, and there is a good business reason for this, and the training is necessary, you might try and resist, but eventually your employer might insist.
