Tableau Desktop Specialist certification is a very foundational level certification that Tableau offers. But, anyone cannot guarantee the difficulty level of the exams. If you have gone through all the topics of the blueprint in the exam guide then you are good to go.
If you are looking for an online training course to clear the Tableau Desktop Specialist Certification exam, then check out this Tableau Certification Course by Intellipaat.
Also, watch this video on Tableau Desktop Specialist Certification to understand more: