If you are established in civvy street (good money etc) then do think long and hard about becoming a regular. It is a completely different kettle of fish to being in the reserves and I say that without exaggeration.
What I will say is make sure you fully research your chosen trade before...
I'm a regular (RAF), 11 years done to date. If it's a lifelong ambition then go for it but I can guarantee it will fall short of your expectations in some capacity. Personally speaking I regularly fantasise about that day in 9 years time when I'm pensionable and can down tools. Fed up of...