Chastity and orgasm denial discussion

Hello! I’m not entirely certain this is the right spot to ask, but I have a query regarding Urethral tubes. I purchased and since it’s my first time using one, I’m unsure what to anticipate. When I began inserting the tube, about a quarter of the way down, it felt like it was scraping against something so I paused. Since this is an inexpensive device, I want to ensure I’m not causing myself damage. Is that sensation normal? Does insertion become easier with more practice? My wife is interested in getting a steelworxx looker, but we’d prefer to test out the budget-friendly option first before committing our funds.