Procedure should be performed at 6 - 12 months of age; complications have a higher risk of occurring if delayed. If your pup goes into heat wait 2 - 3 months before surgery.
Once you have made the decision to spay, put careful considering into picking the surgery day. If you work during the week (like myself) I recommend FRIDAY. Your pup will need 24hr attention for three days. Total healing period is 7 - 10 days. If your schedule is not predictable please give your employer notice to be with your pup. Other options are having family members or close friends to puppy sit (please make sure it is someone you trust and they are knowledgeable about dogs).
Fast pup prior to the surgery (the night before): no food after 8pm & no water after 12am. Make sure to walk and relieve your pup the next morning before travel.
Typical spaying procedures will have you bring the pup in when their offices open in the morning. Once there you will do light paperwork confirming contact information & going over any other procedures you may want done (i.e. Vet's will also take this time to remove baby teeth that have no fallen out yet; at this time you also have optional annual blood testing). Pick-up will be later that afternoon before the office closes.
When arriving later in the day to pick up your pup bring a soft, quiet, and relaxing mind. Have you ever "been under?" If so you remember what it feels like to wake up. Your dog will appear very drained and "out of it." If your Vet does not offer, ask about extended pain medication that can be given orally with a syringe. Be gentle & careful as you travel between the office and home.
Once home offer water. Don't be alarmed if they are not thirsty just yet. Allow them to rest for an hour. Offer water again and a soft treat (i.e. soft chew liver bites). Don't allow them to over eat; during recovery there is a risk of vomiting. Light markings of blood around the incision is normal (do not attempt to wash off). This area will be very tender and sore for the next week.
<~ Female Pomeranian after Spaying procedure. Visible incision with bleeding.
Create a comfy place for your pup within the "center" of the home; a place where she can see you at all times when she wakes. Or offer them their crate to hide away in. This all depends on the pup; some dogs are starved for attention at this point while others need away time. Either way provide a quiet relaxed environment in the home. Low stress levels provide faster recovery.

Also notice the shaved legs/bandaged leg. This is where they inserted any needles or IV.
Allow your pup to sleep it all off, but keep a close eye on her so that she won't lick or scratch at the incision. If you can and prefer, carry your dog to water, food, and outside when she wakes up. Less walking means less pain.
<~ sleepy Pomeranian at 7pm after surgery
Wishing all of your dogs a safe & fast recovery! Hopefully these personal tips from my own experience have helped you! For more detail information or any other advice always feel free to contact me. :o)