Could I say No to God's face?

Hearing God's directive Moses replied:

"O Lord, I have never been eloquent, neither in the past nor since you have spoken to your servant. I am slow of speech and tongue."

The LORD said to him, "Who gave man his mouth? Who makes him deaf or mute? Who gives him sight or makes him blind? Is it not I, the LORD ? Now go; I will help you speak and will teach you what to say."

But Moses said, "O Lord, please send someone else to do it." (Exodus 4:10-13)

When we hit that passage in bible study on Sunday morning, I thought to myself, "Wow, imagine seeing God FACE to FACE?! Hearing his voice as clear as one of my children calling to me, or my husband chatting with me. Could I say 'NO, I can't Lord.' to HIS FACE?"

I wondered if I could possibly doubt my ability to do what He was asking me, while standing on Holy Ground seeing Him, GOD, in front of me? Wouldn't I, if God was speaking to me directly assume He would give me all I needed, to do what he wanted of me.

Then I thought about how I daily tell Him.... NO.

Each and everytime I complain about my crosses, I am saying;
" No God, I don't think I can do it. I don't think I can complete this errand you are giving me. I don't want this job - please give it to someone else. "

I think instead of sighing and saying I can't do this anymore Lord, I will try to just ask for help.

"Help me o' Lord. My cross is becoming heavy and I am afraid I will drop it. I feel as though I am falling. Send me the graces not to fall, to not drop my cross! Thank you for hearing me Jesus, thank you for helping. I know you are there Lord because you promised me you would be!"

'Take my yoke upon you and learn from me, for I am gentle and humble in heart, and you will find rest for your souls. For my yoke is easy and my burden is light." Mathew 11:29-30