If I didn't need it for my helis, I wouldn't carry my starter.

I start a OS.10 and AP.15 all the way to a TT120, G38 and 62 by hand. I don't own a 4s.

As Downunder said;
When you have the experience to know 'exactly what it takes' to hand-start an engine with one flip, it's very easy and safe.

If you always use a starter, you'll may never learn.

Here's some tips:

*Prime with carb open, plug exhaust or intake and NO GLOW.
*Always flip-start at idle or just above - NEVER WHEN OPEN
*Don't forget to dull the sharp edge of a new prop (trailing if you flip CCW)

Kirk