Which is correct?

If you do it correctly, it is hard.

OR

If you do it right, it is hard.

Both of those are correct usage. Using correctly would probably be preferable.

Both are correct. Both correctly and right are used as adverbs modifying "do."

Thank you GuruBlue and Ms. Sue!

Both sentences convey a similar meaning, but there is a slight difference in context.

1. "If you do it correctly, it is hard." This sentence implies that the task is inherently difficult, and no matter how well you perform it, it will still be challenging. The focus is on the level of difficulty rather than the specific method or approach used.

2. "If you do it right, it is hard." This sentence suggests that if you follow the correct method or approach to complete the task, it will be difficult. The emphasis here is on the importance of using the right technique or approach in order to achieve success, even if it is difficult.

To determine which sentence is correct, you need to consider the intended meaning based on the context and your intention. If you want to convey that the task itself is difficult regardless of how it is done, then the first sentence is more suitable. However, if you want to emphasize the importance of using the correct approach, then the second sentence is more appropriate.