You -- The  "you" here in the second-person pronoun in form of a singular subject. Since, as the subject of the sentence, it is part of the verb, its explicit use repeats the idea of who is speaking, "you." Saying "you yourself" captures this feeling in English.

missing "yourself" -- (MW)  The subjective pronoun repeats the information in the verb so it should be repeated in English like "you yourself."

do -- This English helping verb is used to create questions, commands, negative statements, and smooth word flow in translation from Greek

not -- The Greek word translated as "not" is the Greek negative used to deny objective facts, not opinions. It means "no," "not," or"no truly." It makes a negative statement of fact. Adding "really" to the sentence captures the same idea. When a negative precedes the verb, it affects the whole clause.

realize -- (CW) The word translated as "realize" means primarily "to see" and is used to mean "know' as we use the word "see" to mean "know" in English. It is the past perfect tense so "have seen" but it is translated as the present tense of "know."  What someone "has seen" is what they "know" in the present. This word is not translated as "realize" elsewhere.

now; -- (CW) The Greek word translated as "now" means "just" or "exactly and "now" in the sense of "just now" when applied to time. It is not the common adverb usually translated as "now" but one that means "just now" or "as yet" implying a change in the future.

what -- The word translated as "what" is a demonstrative pronoun ("this" "that"), but it often acts as a pronoun "which," "what," "who," "whosoever," "where," "for which reason," and many similar meanings.

I -- The pronoun "I" is used here. Since, as the subject of the sentence, it is part of the verb, its explicit use accentuates who is speaking "I." Saying "I myself" captures this feeling in English.

missing "myself" -- (MW)  The subjective pronoun repeats the information in the verb so it should be repeated in English like "I myself."

am -- This helping verb indicates the present tense of the verb. It is used here to form the present, progressive tense, which doesn't exist in Greek but which can smooth the flow of English sentences.

doing-- The Greek word translated as "doing" has the primary meaning of "making" or producing" something or "causing" or "performing" as service. It describes a productive action.  In English, "do" is also frequently a helper verb. This Greek word is not used as broadly. When it doesn't have an object, the verb is more clearly translated as  "perform."

but -- The Greek word translated as "but" means "but," "however," and "on the other hand." It joins phrases in an adversarial way. Since it always falls in the second position, translating it as "however" often captures its feeling better.  It can also be an explanation of cause ("so").

later -- (IW) There is nothing in the Greek that can be translated as "later" in the Greek source.

you -- This is from the second-person, singular form of the verb.

will -- This helping verb "will" indicates that the verb is the future tense. Helping or auxiliary verbs are needed to translate the Greek verb forms into English.

understand -- (CW) "Understand" is a verb that means "to know," "to recognize," "make known," "to know carnally," and "to learn. Since the verb meaning "have seen" is also used to means "know," translating this one as
"learn" makes more sense, especially in the future tense.

missing "by"  -- (MW) The untranslated word "by" or a related concept such as "among" or "by the means of." It also refers to "after" or "behind" when referring to a place, time, or pursuit.

missing "these things"  -- (MW) The untranslated word "these things" is a pronoun that can mean "this" or "that," the nearer or the further depending on usage. It follows the noun so it repeats the idea of the noun as "this one." It is often used in the neuter plural to refer to "these things."