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I will help you with the answers to your questions in sequence.
1) Surgery is safe after 4 years and when there ia no active infection running in the adenoids
. Hence series of antibiotic courses are given.
2) There would be no specific preoperative complications, Intraoperatively the child is vulnerable to the compications of the general anaesthesia
, Bleeding which is rare and If bleeding does occur, the surgeon may insert a pack of gauze into the nose to stop the blood flow for subsequent removal after a day or two.Post operative complications could be bleeding ( reactionary , infection , Hypernasality and difficulty in swallowing .
3) The measure of the success is by symptom free child and no leftout adenoid matter on examination by ENT specialist
4) yes, its most often adenotonsillectomy,very rarely not coupled with tonsil excision .
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