The procedure, done by a capable surgeon, is almost so simple it can be called "trivial." A few will have some swelling for a bit after, and strenuous activity should be avoided for a while.

It is considered mandatory that follow up checks be done to assure not only that the surgery was successful, but that all "remnant" little swimmers have been expelled or have expired.

In most cases, if the vasectomy is done by a competent surgeon, the vasectomy is reversible if done within a reasonable time; however the reversal is microsurgery (no reflection on the patient, and no pun intended) and is not as simple. Because rather delicate sutures are required and scarring can prevent success, a slightly longer recovery period is needed. I know at least two who have had reversal surgery with successful results. I suspect a couple of others, but they were less open about it.

Most surgeons will caution that you should not count on being able to reverse a vasectomy, but anyone who's situation changes so that reversal is really wanted should certainly get an evaluation of their personal condition to see whether there are any conditions that would prevent it.

The only common complication of vasectomy is that occasionally some of the little critters, still produced and expected to be "resorbed" in the body, may fail to be fully absorbed. The result can be some "nodules" that may be transient or permanent, with transient appearance being much more common than any permanent effect. If this should occur and seem persistent, it should be brought to the attention of your medical consultant, and in some cases examination may be recommended, usually via ultrasound imaging, to rule out the unlikely serious and similar appearing malignancy. The vasectomy doesn't appear to affect the likelihood of the more serious events, and any such unusual happening should be checked regardless of whether you've had the surgery.

Various surgeons have differing customs with respect to pre-counselling and approvals, but the general rule here (US) is that if you are married spousal consent is required. There is no particular reluctance to perform the surgery on single men, so far as I have seen, although young men who have not had a family might encounter some caution on the part of the physician.

I would probably recommend that anyone considering a vasectomy should consult a "specialist" who has experience with the procedure. Although it's simple enough that almost any surgeon should be able to do it, "practice makes perfect" and it is sort of personal. A specialist who does it often is likely to be more "up front" about it, simply from being accustomed to dealing with patients' questions.
Perhaps more importantly, the whole staff at the specialist's facility will have used up all their bad jokes and will be less likely to react embarassingly.

John