there is never a good timing to "flog" off stuff you do not need... for me personally I will put a few on gumtree and wait for response... sometimes an ad can be there for 3 weeks then you get a bite... it is really a hit and miss with gumtree (of course if you price is way below cost price - the sms/ calls will flood in)

You are going in the right direction with thinking carefully what you want to mainly focus on... and hopefully stick to it... it will be challenging but when good will power i am sure you can do it...