Good advice about taking an instructor with you every so often while hour building.
Most will do it in an 'unofficial' capacity for £20 cash or a few beers.
Do your CPL over as short a time as possible ...rule No1!!
I used to instruct CPL and it was amazing how far students fell back if they had long or even shortish lapses.
An IMC does help if you can afford one in advance, it may save you a few quid in the long run.
good luck