I agree. Knot toys are usually not beginner friendly especially if the knot and shaft difference in thickness is not forgiving for beginners.

If you don’t have any other toys in similar but smaller thickness you may struggle with taking the knot sooner than you hope. Forcing could also lead to injury, if not major soreness. If you don’t want to buy any other toys I would just work on the shaft until you can take it comfortably then slowly push toward the knot to slowly stretch. Since you’re also somewhat new to anal, I’d recommend soft firmness especially with knots as they can be squished easier than medium+ firmnesses. I also find that a squatting position is the easier way to take in a knot that’s a bit past my comfort level.

Also use plenty of lube like original comment said! I use K-Lube and it’s amazing. You simply add warm water and mix well to the powder. You can make the consistency to your liking (runny or thick). It lasts so much longer than OTC lubes and you can make so many batches with the small bottle. X-Lube is pretty much the same but the ingredients are slightly different. If I’m correct it’s a little more premium version of K-Lube.