One thing I've learned going through this journey of schooling, is that you have to go with your gut. If you think you can do it you can, if you think you can't, you won't. For every person that took them together and failed, there is another that did and earned A's in both classes. It really comes down to how bad do you want it, and how much work are you willing to put in to get it. It sounds like you will do fine if you choose to do it concurrently.