Any surgery done under General Anaesthesia is a major surgery. As Septoplasty can be done under General Anaesthesia and also under Local Anaesthesia, that decision is best left to you and your surgeon. Unlike practicing medicine, surgery is a fine art and the skills possessed by different surgeons vary depending upon their aptitude, training, and experience. The most important thing to note is that the surgery is merely the first part of the treatment process. Then comes the postoperative care over the subsequent 2 weeks and then the main medication for your sinusitis which may extend over months to cure you. Surgery only cures the nasal obstruction and makes the pathway for intranasal medicines to reach all the nooks and crannies of your sinuses which will ultimately heal you.
Next Steps
Choose your surgeon carefully, by Googling him, reading past patients feedbacks on different apps like Practo etc.