Scheduling appointment for H1/H4 VISA stamping


My H1B petition is approved and I have made the VISA Payments for myself and my dependents.

I tried to schedule an appointment and I did find some open slots for OFC at all centers (earliest being Chennai - 12th Aug). But when I moved on to the next page for VISA stamping appointment it said that there are no slots available. Is it something everyone experiences?

Some questions on the same:

  1. Are OFC and VISA appointments available in general or is it not worth to check right now?
  2. If they are available, how difficult or easy is it to find one?
  3. Is there a time in the day where one can try the scheduling?
  4. Does the account get frozen if you try too many times in a day?

Any tips on this will be really helpful.