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Congrats in your first scope Richo!
Those lockable wheels will definitely help moving your scope around.
Magnitude is basically another way of saying brightness, with the higher the number, the fainter the object, and obviously negative numbers being brighter still. So, in theory, if the lowest workable magnitude of your scope is +8, anything less than that should be able to be viewed.
BUT, usually that workable magnitudes depends on perfect conditions. That number is usually lowered by poor atmospheric, or 'seeing' conditions, light pollution, and all manner of other variables. According to the figures, my 12-inch dob should be able to get mag +15 objects, but I've never seen anything anywhere near that.
Having said that, the Lagoon and Triffid should be fairly easily visible through your scope. Have you double checked the location with a star alas? If not, it might be a good investment, along with a red torch, as using your phone may also be killing your night vision, and be making the faint fuzzies harder to see.
Also, it's important to have realistic expectations of what you'll see. You won't be able to see the bright colours and patterns seen in most photo's, we use the term 'faint fuzzies' for a reason. The best way is to check out some of the sketches done by some of the members here, they give a much more realistic depiction of what to expect at the eyepiece.
As for back problems, consider making or buying an observing chair. Comfortable viewing is key to enjoyment of your hobby, and being uncomfortable will only discourage you from getting it out. Might be a good time to look into some thermal clothes too, warmth is just as important as comfort.
Congrats again, hope it helps.
Davin
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