The internet is a wonderful thing, but there is only a certain amount of advice that can be given. This subject has already been covered on this forum - try attending an LDMCC clubnight - there will be older members there who are not computer orientated, but can give much valuable advice. Unfortunately, Douglas is one of the less common makes, and subsequently has few specialists - members often carry out there own repairs with guidance/assistance from longer standing fellow owners.
Regards,
Eddie.