YOU can do it.
Not someone smarter, stronger, wiser. Not someone younger, more educated, more influential or powerful. Not someone else. You.
You CAN do it.
Not may be able to eventually, with lots of help and lots of advice from lots of other people. Can, now, as you are.
You can DO it.
Not think about it, not postpone it until you understand it fully, after examining all the pros and cons, not delegate it to someone more capable. And not try and fail. You can DO it, now, present tense.
You can do IT.
Whatever he says. Nothing excluded, everything included, if he says it, you can do it.
“And I thank Christ Jesus, our Lord, who hath enabled me, in that he counted me faithful, putting me into the ministry.” (I Tim. 1:12 KJV)