Tele class right after orientation...Too much?

I recently started on a medical/telemetry unit after graduating in May and am in my first solo weeks after 8 or 9 weeks with various preceptors. They have me taking 4 pts this week, next week 5, and then I'll be considered officially off orientation taking 6-7. I feel really good about my ability to independently care for 4 patients well, but I know it will get more difficult from here. Taking 6 and 7 pts, even with a preceptor, felt like enough stress to burn me out in no time, especially because the assignments are rarely made with any attention to acuity! There is a tele class starting in a few weeks and my team leader is signing me up, but says that if I feel it's too much, I can hold off for now. I want to go to this level for sure, but it seems like tele nurses often get even more intense patients, and the charting is more time consuming. Plus I will be adding the class to a full time schedule for a few weeks. I'm not sure if I should just go for it now, or try to take it more slowly... How difficult is it? Does anyone have advice?