I can try. ČEKAT is to wait and the verb is in imperfective grammatical aspect. It can take forever, it can be repeated. POČKAT is perfective. It happens once and when it is over, it is done. Sometimes this property makes a huge difference in meanings. In this case the line is little gray. You could use both and it would not really change the meaning.
I appreciate the suggestion but disagree. The initial past tense skill actually does--but should not--mix in perfective verbs. It is the first place where the perfectives can show up, and showing both the past tense and some weird new class of verbs for the first time simultaneously is too much to handle for many people.