I can also give you an advice for pasture problems, take in consideration I write almost the whole day and have no back problems whatsoever... Get not a good, but great chair, keep your feet a bit elevated with a small chair or whatever so that your weight doesn't squash your leg muscles and by all means the writing surface has to be as close to your lap as possible, which means you have to elevate a chair up to the table. I even saw off side panel of my writing table to get so high, and it is perrrrrrfect. Take care and stay well.