Step-by-Step Crochet Row Instructions

1st Row (RS): Ch 147, 5 dc in 6th ch from hook, *ch 1, skip 5 ch, 5 dc in next ch, repeat from * across to last 3 ch, skip 2 ch, dc in last ch, turn.
2nd Row: Ch 4 (counts as dc, ch 1), dc in first st, skip 2 dc, dc in next dc, *(dc, ch 3, dc) in next ch 1 sp, skip 2 dc, dc in next dc, repeat from * across to last 3 sts, skip 2 dc, (dc, ch 1, dc) in top of turning ch, turn.
3rd Row: Ch 3 (counts as dc), 2 dc in next ch 1 sp, ch 1, (5 dc, ch 1) in each ch 3 loop across, 2 dc in ch 1 sp, dc in top of turning ch, turn.
4th Row: Ch 3 (counts as dc), *(dc, ch 3, dc) in next ch 1 sp, skip 2 dc, dc in next dc, repeat from * across ending dc in top of turning ch, turn.
5th Row: Ch 3 (counts as dc), (5 dc, ch 1) in each ch 3 loop across, 5 dc in last ch 3 loop, dc in top of turning ch.
6th Row: Repeat the 2nd row, fasten off and turn.
7th Row: Join eggshell in first st and repeat Row 3.
Is there a multiple of chain's if you just wanted to do a swatch first bef you take on a big blanket?