Many patients are skeptical about radiofrequency ablation for the treatment of various tachycardias, either by exaggerating the risks or underestimating the difficulties. Because arrhythmias are abnormalities of the heart’s bioelectricity that are not visible to the naked eye, they are abstract in presentation and difficult to understand visually in words for patients. To facilitate patients to accurately understand the difficulty and risk of catheter ablation for their arrhythmias, we explain them here. Many patients with paroxysmal supraventricular tachycardia (generally referred to as supraventricular tachycardia) are filled with concerns about their ablation procedure that are completely unwarranted. In fact, ablation of supraventricular tachycardia is the most basic introductory procedure for all physicians who perform catheter ablation, and it is like an appendectomy in general surgery, which can be done in general 3-A hospitals. The difference in level between doctors is mainly in the length of the procedure and the degree of patient pain. Highly qualified surgeons usually need only 30 minutes to 1 hour to complete a supraventricular ablation. Also, a few surgeons can complete the procedure entirely through one femoral vein, so that instead of puncturing the neck, chest, or both thigh roots, only one thigh root is required, and no artery is punctured, resulting in a quick postoperative recovery of 6 hours on the floor. In individual patients, the lesion (usually a bypass or slow pathway) may be close to a critical tissue called the Hitchcock bundle, which is relatively easy to cause impaired atrioventricular conduction during ablation and requires a pacemaker in severe cases, but is actually relatively safe for experienced surgeons, and third-degree block rarely occurs. The more difficult ones are episcleral bypasses, but they are extremely rare, and in the case of left-sided episcleral bypasses, they can be successfully ablated through the coronary vein easily by a slightly more experienced surgeon. Ablation of atrial tachycardia and atrial flutter is also relatively simple, and the success rate and time spent on the procedure depends on the level of experience of the surgeon. More problematic is the ablation of specific scarring atrial tachycardia in certain patients who have undergone surgery for complex congenital heart disease, which is relatively difficult. The difficulty of ablation ventricular tachycardia varies widely for idiopathic (that is, patients whose heart ultrasound, CT, and other tests do not reveal organic heart disease). Ablation success rates are generally high for common sites, but may be more difficult for specific sites. Ablation of atrial fibrillation is currently difficult, and the biggest challenge is that the lesions are extensive and recalcitrant, making it difficult to ablate completely. In general, the older the patient, the longer the history, the larger the left atrium, the longer the drinking period, and the combination of diabetes mellitus and dilated cardiomyopathy, the lower the success rate. Instrumental ventricular tachycardia is the most difficult and risky procedure in catheter ablation, and overall only a very few individual physicians in top hospitals internationally are able to master it, and patients should be well informed before undergoing ablation.