It'll be alright. I took mine apart last week to get out a broken needle. Then I thought what the heck lets just take it all apart and clean it and look around. Its a Brother 450Q. The only advice I would give is to make sure his tools are not magnatic, thats if you have a digital display. If its not you should be fine. Might wanna check the hook to make sure you didn't scratch it with the jam. I've had to sand mine down before because it wouldn't bring up the bobbin thread with the burr or scratch on it. Sending my handyman good wishes your way!