It's a great training set with discreet packaging and even have cute little cloth bags for each plug, just remember that if you get stainless steel plugs like these that you'll need a silicone-based lubricant, I use Astroglide. If you buy a silicone plug then you'll wanna go with a water-based lubricant.
Be sure to put lube on your finger and finger yourself to get a little lube inside aswell as lubricate the plug and apply steady pressure and twist it, if you feel a slight burn you should be fine but if it's too much then add a little more lube. And don't be alarmed if you go to the bathroom and find a tiny bit of what looks like blood, it's pretty normal and happened to me a long time ago, but if you see a lot and see it often then definitely get it checked out, it's just a bit delicate in there but a visit to the hub will show you can take much much worse than a plug back there lmao.
Hope I was of some help, have fun and be safe!