FWIW,I'm sold on cartridge razors(Gillette Mach3) each one lasts minimum a month of 5 to 6 days a week shaving(24 to 28 shaves) but sometimes can last much longer,the longest has been about 10 weeks+.
I use dove liquid soap from my hand,and dispensed with a brush sometime ago.
The procedure is to rinse the beard with hot water as hot as you can stand,until you feel it softening,then add soap onto the hand and lather the beard,then shave in the opposite direction of the way the hair grows(against the grain) rinsing the razor out every second pass.
Cleanest closest shave I've ever had in the 50 years I've been shaving
I rarely cut myself but use a styptic pencil or antiperspirant rock(same thing)if I do.
For legs it's the same procedure lather them up whilst in the shower,then shave from ankle upwards,being careful around the knees as mine are bit boney

,I stop about mid thigh above cycling shorts length.
A quick rub with hand cream afterwards and ahhh! nice
