The cheap method is to make a thinner bit of plate to fit between the manifold and the valve to stop the gas flow, which has much the same effect, then you don't need to do the other bit as it effectively just stops the gas flow.
There is also some electrical garbage on the injector pump but this can be left in place, it doesn't do anything apart from indicating throttle position to the EGR unit so that it closes the EGR valve when you press the throttle (or doesn't close it - leading to the mess shown above!) This would allow revenge to be wreaked upon the EGR valve with a hammer before depositing it in the bin If it were mine I'd buy the blanking plate for the exhaust manifold, a new intake hose for the intercooler to inlet manifold. I've also heard of ball bearings being jammed into the pipes etc but this isn't something I've tried. As for the valve - well you can either take it off completely (2 screws - sometimes Allen headed ones - which will usually put up a fight) and fit the blanking plate as fitted to non EGR vehicles. The best (neatest) solution to the latter part is to buy a non EGR top intercooler hose but the other way is to crimp the little intake pipe flat in a vice, fold it over and solder it or braze it shut (you probably don't even have to do this last bit a crimp may well be fine). There are basically two bits to blank off, the EGR valve on the exhaust manifold and the pipe where it feeds in to the intake just before the inlet manifold. If it is really bad and the ports in the head are bunged up with carp, it may be a bigger job.
The inlet manifold, if it looks like that one above, may also need taking off in which case you'll need to change the manifold gasket. All you need is tools some solvent and preferably an air compressor to blow everything through with afterwards. At the basic level its an easy DIY job which is take the intake plumbing and intercooler off, flush it out with a suitable solvent, dry out thoroughly and refit.
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