I do use a remote as I think they work better, but as Zen said, setting your timer works well too. Where you will run into issues using just the timer is if you want to take multiple 30 second exposures (for example) and stitch them using something like Starstax. I prefer taking multiple 30 second exposures as opposed to one super long one if I'm doing star trail shots. It would be very hard to do that using the timer on your camera as you would have too long of a delay in between shots and youd end up having little breaks in your star trails. But for single exposures, the timer works just fine!