Lighter or a small blowlamp - carefully - don't let the flame touch the shrink sleeve.
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You can sometimes just about do it with the soldering iron shank rather than its nib. You need to just rub it backwards and forwards quickly over the sleeve whilst slowly rotating the wire. Not the best of jobs but might be hand if you're stuck.
I always use a heat gun on lowish heat and which is always on board (unlike your hair drier /forums/images/graemlins/smile.gif), that requres 230V of course - but is no other proper way unless into very big industrial sized cables and heavy lined shrink.
I bought a new gas match for lighting my cooker from ASDA some months ago. It puts out a flame like a mini blowtorch which is ideal for heat shrinking.
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Hairdriers are not hot enough to seal heat shrink properly, best bet at home is an electric paint stripper.
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Actually you can with luck. If you partially cover up the air inlet the output air temperature rises. If course said hairdrier may expire - in which case its important to return it to SWMBOs drawer in the exact position as found ....
I use an iroda MJ-950 Unltra-Therm, gas gun made for the purpose. Has auto ignition and heat shield. With the mesh end removed, it becomes a fully adjustable, fine gas torch. Fill with lighter gas. Available from CPC.co.uk.