~こと請け合い => I guarantee ... N1
Happens next
の下で/の下に => under; with ~ N2
場合(は) => in the event of; in the case that ~ N4
以下 => As follows, below N3
Standard
のが下手 => to be bad at doing something N5
て[下「くだ」]さる => Do for someone N4
Give and take advice
[以下「いか」] => Less than A, under/below A (amount) N1
Degree/ Level/Amount
て下さいませんか => Please do A (polite) N5
Asking and Telling
[下「くだ」]さる => Give B to A (A is you, your friends, your family, etc.) N4
Give and take advice
につけ~につけ => each time, whenever, either way N2
…けれど => Explanation N3
Exclamatory
だけ => only; just N5