I'm getting ready to start a new character here and am wondering how difficult it is to get to around level 55-60.
I've never really went much past level 40 before because I just never really used that many skills.

This character I am planning on uses a lot of skills.
One-handed-5/5 armsmen,fighting stance,critical charge & savage strike

Two-handed-5/5 barbarian,champions stance,critical charge,devestating blow & sweep

Heavy armor-5/5 juggernaut

Block-everything but quick reflexes and only 1 in shield wall

Smithing-steel,elven,advanced armors & arcane blacksmith

Restoration-adept,regeneration & respite

Alteration-expert,stability & atronach

Enchanting-5/5 enchanter

That takes me to level 51.
I would really like to fill out the restoration tree up to master,because this character is about killing the undead,but that would take me to level 54 with the ward absorb perk also.

Weapon specific perks would be nice but that would be an additional 6 levels to level 60.

With those 8 skills,and of course lockpicking and speech will level up a bit naturally,would that be enough to hit around level 55 or so?

I don't usually use more than 5 or 6 skills so I have no idea what it takes to get to such high levels.

if you put the time commitment in you can easily reach past level 50 with any playstyle, if you max out melee and archery switch to destruction magic, just make sure you have around 200 magicka alongside your health and stamina.

Thats just it,I really didn't want to have to go into too many other skills.
Maybe a little alchemy for money and speech will level up by itself.