Changing liquids and cleaning will become obvious when you have the new tanks in your hand. Most BCC are straightforward enough. Everything is done with it upside down....
I never had much long life from the coils, unless I used iClear16s and they lasted ages. Best guess is less than a week. I always knew when it was getting bad, taste and vapour (both getting worse) are easily spotted.
I use iTasteVV v.3 from 9-5 (working day) and have not had any regrets. I also used Vision Spinners in the past.
iTaste VV V3.O Kit - Starter Kits
and here is the new one
Vision Spinner 2 1650 Mah
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You are always welcome to ask about best prices (UK) as I know which vendors tend to be good value. I also know which vendors offer no discount and take the p*** with their prices. Just because it's cheaper than smoking, doesn't mean we shouldn't try to avoid unnecessary expenditure.
The market is quite unpredictable. Liquid can cost anything from £1.50 to £7.99 and price is often not a helpful indicator of quality/taste.
Clearos can cost anything from £2.99 to £25. Some places like to charge £8 for clearomisers you can find in 30 seconds on google for £3.50.
The cost that annoys me is the replacement heads. I pay £6 for 5. I know vendors that sell them for £2.99 each. That makes a huge difference over a year.
I did a price comparison once for a newbie on AAEC UK. £300-£400 a year is worth having.