Getting yourself to appointments can be a challenge as your situation changes. There may not be anyone to take you to appointments and you may have to rely on public transport. There may not be enough time to get there between lectures or after work. The hours for most appointments are between 9 and 5pm. You need to think about all of this and plan ahead.
Not many centres run an after-hours or weekend clinic that you can attend. Some private specialists do a late clinic so this may make it easier to find a suitable time that fits in with you.