First of all, good for you for nursing 16 mo! That's way longer than the average US mom. If you're ready to wean, then it's time. Nursing is a two way street--if you resent nursing, then you're not doing anyone any favors, imo.
I would recommend you read "How Weaning Happens." You can buy it or your LLL leader should have it in her library for you to borrow. It gives great tips on gentle weaning.
We recently nightweaned my 2yo because I'm pregnant and it was just too painful for me. There are probably other ways to do it, but all we did was just *not nurse* between the time I went to bed and daylight. The first few nights were rough, but after that it got much easier. Dd stayed in our bed the whole time. Dh and I would rub her back and legs, pat her back, walk with her, take her for car rides--whatever we needed to to get her back to sleep. She pretty quickly learned to get back to sleep on her own.
As far as day weaning goes, it depends on how much of a hurry you're in. If you're not in a rush, you can do the "don't offer, don't refuse" technique--probably the most gentle way to go. I'm in kind of more of a hurry, so we've started limiting to 3 times a day--morning, noon and bedtime. I'm doing that for a month, then 2 times a day the next month, then once day until she's weaned. It's working well for us, but I think it depends on how "ready" your child is.
I'm sure you'll find a method that works for you. Please take my advice with a grain of salt--I'm no expert, I'm just telling ya what worked for us. Best of luck to you!