Hi Liz,
Collimation is a cinch, Liz. Don't be deterred by all the faff written about it. It's made much simpler with a Laser-type collimator though.
I could never get up the courage to do it then finally HAD to or buy a new telescope.
Took about five minutes including tea-break.
If that doesn't help, I recommend an extension tube in the focuser(Thanks to everyone who helped me out on this one!). About 35mm should do.
Another possibility, if you can't reach focus after collimation and with an extender tube in the focuser, is that he OTA is too short. Mass-market Newts can't all be perfect. I had an 8" Skywatcher dob with the same issue and it turned out the OTA had been assembled incorrectly.
Fortunately SkyWatcher has pretty good customer service, so you don't be shy to give them a call.
Peter