'In the beginning' and 'At last'

[Jesus1]

Hello! How do ya feel?

Have a look at this sentence:

'AT FIRST he opposed the marriage, but IN THE END
he gave his consent'

Could I use 'In the beginning' instead of 'At first'
and 'at last' instead of 'in the end'?

Do they mean the same?

If not, could you give some examples with
'In the beginning' and 'At last'?

Thanks a lot!

Jes?s

[Mister Micawber]

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Yes, your substitutions would be fine, Jesus.
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Native English teacher at Mister Micawber's