ては[初「はじ」]めて => Only after A did (I) B N3
Time, Situation
始める => to start; to begin to ~ N4
あらためる => to revise; to replace N3
Happens next
をはじめ/をはじめとする => For example, A N2
Lists, Examples
めったに~ない => hardly; rarely; seldom N3
ひとつには…ためである => Partly because of ... N3
Cause, reason
めったにない => Rarely N3
Degree. Level, Amount
[命令「めいれい」] => Do A (command) N4
Can, Should, Must
[始「はじ」]める => To begin to A; A begins N4
Secondary Verb
~ためしに…てみる => to attempt, to test, to try out N1
Invite and advise
~んがため(に)/~んがための      => in order to ~ N1
... いらいはじめて => Since... this is the first time N3
Time