Butt plug?

To

So my boyfriend has been wanting to try anal for our entire 4 year relationship. At first I wasn't into it but over the years I've started to want to try it. But tbh I'm nervous as hell. My man is anything but small. We've been waiting until I could get a kit to use to stretch myself. But recently I have been thinking about getting a butt plug and surprising him with it. That way I can take my time getting myself ready and not feel super exposed like I would if he prepped me. Would a butt plug be enough to stretch me out? I want to do it withiut him knowing at all. Just get down to business and have him discover it. Any advice about plugs or just anal in general is greatly appreciated.