Increasing in knitting help

[annonymousnamechange]

Hi, I'm knitting a jacket from a Yarn Stories pattern. I've got 134 stitches on the needle and the next instruction is:-

Cast on 43 stitches at the beginning of the next 2 rows.

So is there a technique for increasing a large amount of stitches at the beg of a row that I should use? I usually just increase by knitting into the next stitch but that won't work for 43! Or do I cheat and just add the stitches at the end of the row and hope for the best? It's got a raglan type sleeve which is why you get the big increase and a bonus of not having to sew the sleeves in! Thank you 😊

Knitted cast on - knit into the first stitch and put the loop back on the needle, repeat until you have the number you want. Or backwards-loop cast on. In effect you are casting on stitches at the end of the previous row, and knitting them as the start of the increase row

Yep, I'm with @Discombobble though you can add the stitches at the end of each row if that is easier for you.