Hardest thing in career mode is...

[bjbeardse]

No mechjeb...

[davieholgate]

No mechjeb...

Haha, takes a while but don't worry.

Manoeuvre nodes are your best friend

(I use MJ too )

[falconek]

Carreer mode can be quite hard if you didn't trial-and-error everything before, you don't know which parts and when are unlocked and you don't use following:

-launch window calculators

-deltaV maps

-engineer redux

-mechjeb

Just imagine, you're not someone, who played since 0.15 and can land on Mun with eyes closed. Imagine, this is future, year 2030 and you just bought a 1.0 version of KSP. This is your first ever contact with the game ever and you by default start career mode, knowing nothing (also mod-free and whithout help from outside sources). Now career will be a lot of trial and error.